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<!doctype html>
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fancybox: true,
motion: true,
duoshuo: {
userId: 0,
author: '博主'
}
};
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<title> Hexo </title>
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Thoughts
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<time itemprop="dateCreated" datetime="2016-10-13T21:09:43+08:00" content="2016-10-13">
2016-10-13
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<h1 id="u4E3A_u4EC0_u4E48_u4F60_u7684_u77E5_u8BC6_u8FDC_u4E0D_u5982_u522B_u4EBA"><a href="#u4E3A_u4EC0_u4E48_u4F60_u7684_u77E5_u8BC6_u8FDC_u4E0D_u5982_u522B_u4EBA" class="headerlink" title="为什么你的知识远不如别人"></a>为什么你的知识远不如别人</h1><p>今天在这里先起个头,为什么会这样。在这里反思你的学习能力,工作效率。完善你的方法论,世界观。</p>
<h2 id="u5B66_u4E60_u5BC6_u5EA6_u4E0E_u4E13_u6CE8_u529B"><a href="#u5B66_u4E60_u5BC6_u5EA6_u4E0E_u4E13_u6CE8_u529B" class="headerlink" title="学习密度与专注力"></a>学习密度与专注力</h2><p>有的人可能学习了很长的时间,效果却微乎其微。就如同学习英语一样,能是你学习十年的口语水平还没有人家七天集中培训出来的好。这是为什么。<br>最近也在反思,从小学到初中,高中大学,再到工作,一直都在学习,然而学习的效率一直相对低下。如此而来,就在此反思自己的工作,学习,和思维。</p>
<p>表层意识,和潜意识的不统一,很多时候你看似在努力学习,大脑却突然被某些事情打扰,思绪被带走了。这就是你的表层、和潜意识不统一。就是所说的走神。或者更甚发呆。突然觉得这是种很可怕的现象。忙忙碌碌却碌碌无为,很多人终其一生都未能在道路上走远。</p>
<p>惊醒自己,常反思。2016-10-13</p>
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sass语法
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<time itemprop="dateCreated" datetime="2016-06-29T23:01:02+08:00" content="2016-06-29">
2016-06-29
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<h3 id="u6587_u4EF6_u540E_u7F00_u540D"><a href="#u6587_u4EF6_u540E_u7F00_u540D" class="headerlink" title="文件后缀名"></a>文件后缀名</h3><p>sass有.sass和.scss两种后缀文件名。.sass是不使用大括号和分号。.scss是平常使用css文件格式。常规使用.scss文件格式,以避免出现sass格式错误而出现的编译错误。<br><figure class="highlight scss"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">//文件后缀名为sass的语法</span></span><br><span class="line"><span class="tag">body</span></span><br><span class="line"> <span class="attribute">background</span>:<span class="id">#eee</span></span><br><span class="line"> <span class="attribute">font-size</span><span class="value">:<span class="number">12px</span></span><br><span class="line">p</span><br><span class="line"> background:<span class="hexcolor">#efefef</span></span><br><span class="line">//文件后缀名为scss的语法</span><br><span class="line">body{</span><br><span class="line"> background:<span class="hexcolor">#eee</span>;</span></span><br><span class="line"> <span class="attribute">font-size</span><span class="value">:<span class="number">12px</span>;</span></span><br><span class="line">}</span><br><span class="line"><span class="tag">p</span>{</span><br><span class="line"> <span class="attribute">background</span><span class="value">:<span class="hexcolor">#efefef</span></span><br><span class="line">}</span></span><br></pre></td></tr></table></figure></p>
<h3 id="u6587_u4EF6_u5BFC_u5165"><a href="#u6587_u4EF6_u5BFC_u5165" class="headerlink" title="文件导入"></a>文件导入</h3><p>sass的文件导入采用@import ‘文件名’的方式,在此您可以不添加后缀名。sass导入后会生成一个文件,若以@import ‘reset.css’的方式导入,择会以css方式导入,并不会生成一个文件。</p>
<h3 id="u53D8_u91CF"><a href="#u53D8_u91CF" class="headerlink" title="变量"></a>变量</h3><p>sass变量有常规变量采用$开头,后面紧跟变量名,而变量值和变量名之间添加冒号(:)分隔开,如果后面添加!idefault则为默认值。<br><figure class="highlight xquery"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br></pre></td><td class="code"><pre><span class="line">//sass style</span><br><span class="line">//-------</span><br><span class="line"><span class="variable">$fontsize</span>:<span class="number">12</span>px !<span class="keyword">default</span>;</span><br><span class="line">body{</span><br><span class="line"> font-size:<span class="variable">$fontsize</span>;</span><br><span class="line">}</span><br><span class="line">//css style</span><br><span class="line">//------</span><br><span class="line">body{</span><br><span class="line"> font-size:<span class="number">12</span>px;</span><br><span class="line">}</span><br></pre></td></tr></table></figure></p>
<h4 id="u9ED8_u8BA4_u53D8_u91CF"><a href="#u9ED8_u8BA4_u53D8_u91CF" class="headerlink" title="默认变量"></a>默认变量</h4><p>sass的默认变量仅需要在值后面加上 !default 即可。<br><figure class="highlight xquery"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br></pre></td><td class="code"><pre><span class="line">//sass style</span><br><span class="line"><span class="variable">$baseLightHeight</span>:<span class="number">1.5</span> !<span class="keyword">default</span>;</span><br><span class="line">body{</span><br><span class="line"> line-heihgt:<span class="variable">$baseLightHeight</span>;</span><br><span class="line">} </span><br><span class="line">//css style</span><br><span class="line">body{</span><br><span class="line"> line-height:<span class="number">1.5</span>;</span><br><span class="line">}</span><br></pre></td></tr></table></figure></p>
<p>sass的默认变量一般用来设置默认变量,然后根据需求来覆盖、</p>
<h4 id="u53D8_u91CF_u7C7B_u578B"><a href="#u53D8_u91CF_u7C7B_u578B" class="headerlink" title="变量类型"></a>变量类型</h4><h5 id="u666E_u901A_u53D8_u91CF"><a href="#u666E_u901A_u53D8_u91CF" class="headerlink" title="普通变量"></a>普通变量</h5><p>定义之后可以在任何位置使用。</p>
<h5 id="u7279_u6B8A_u53D8_u91CF_u4F7F_u7528_u65F6_u9700_u8981__23_7B_24variable_7D__u4F7F_u7528"><a href="#u7279_u6B8A_u53D8_u91CF_u4F7F_u7528_u65F6_u9700_u8981__23_7B_24variable_7D__u4F7F_u7528" class="headerlink" title="特殊变量使用时需要 #{$variable} 使用"></a>特殊变量使用时需要 #{$variable} 使用</h5><p>在变量作为属性或在特殊情况下等则必须要以 #{$variables}形式使用。<br><figure class="highlight scss"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">//sass style</span></span><br><span class="line"><span class="variable">$borderDirection</span><span class="value">: top !default;</span></span><br><span class="line"><span class="variable">$baseFontSize</span><span class="value">: <span class="number">12px</span> !default;</span></span><br><span class="line"><span class="variable">$baseLineHeight</span><span class="value">:<span class="number">1.5</span> !default;</span></span><br><span class="line"><span class="comment">//应用于class和属性</span></span><br><span class="line"><span class="class">.border-</span>#{<span class="variable">$borderDirection</span>}{</span><br><span class="line"> <span class="attribute">border</span>-#{<span class="variable">$borderDirection</span>}<span class="value">:<span class="number">1px</span> solid <span class="hexcolor">#ccc</span>;</span></span><br><span class="line">}</span><br><span class="line"><span class="comment">//应用于复杂的属性值</span></span><br><span class="line"><span class="tag">body</span>{</span><br><span class="line"> <span class="attribute">font</span><span class="value">:#{<span class="variable">$baseFontSize</span>}/#{<span class="variable">$baseLineHeight</span>};</span></span><br><span class="line">}</span><br></pre></td></tr></table></figure></p>
<h4 id="u591A_u503C_u53D8_u91CF"><a href="#u591A_u503C_u53D8_u91CF" class="headerlink" title="多值变量"></a>多值变量</h4><p>多值变量分为list和map类型。简单来说list类型有点像js中的数组,而map类型有点像js中的对象。</p>
<h5 id="list"><a href="#list" class="headerlink" title="list"></a>list</h5><p>list数据可通过空格,逗号或小括号分隔多个值,可用nth($var,$index)取值。list数据操作还有很多函数。参见[sass Functions][<a href="http://sass-lang.com/documentation/Sass/Script/Functions.html" target="_blank" rel="external">http://sass-lang.com/documentation/Sass/Script/Functions.html</a>]<br><figure class="highlight scss"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">//一维数据</span></span><br><span class="line"><span class="variable">$px</span><span class="value">:<span class="number">5px</span> <span class="number">10px</span> <span class="number">20px</span> <span class="number">30px</span>;</span></span><br><span class="line"><span class="comment">//二维数据,相当于js中的二维数组</span></span><br><span class="line"><span class="variable">$px</span><span class="value">:(<span class="number">5px</span> <span class="number">10px</span>) (<span class="number">20px</span> <span class="number">30px</span>);</span></span><br><span class="line"></span><br><span class="line"><span class="comment">//使用</span></span><br><span class="line"></span><br><span class="line"><span class="variable">$linkColor</span><span class="value">: <span class="hexcolor">#08c</span> <span class="hexcolor">#333</span> !default;</span><span class="comment">//第一个为默认值,第二个为鼠标滑过值</span></span><br><span class="line"><span class="tag">a</span>{</span><br><span class="line"> <span class="attribute">color</span><span class="value">:<span class="function">nth</span>(<span class="variable">$linkColor</span>,<span class="number">1</span>);</span></span><br><span class="line"> &<span class="pseudo">:hover</span>{</span><br><span class="line"> <span class="attribute">color</span><span class="value">:<span class="function">nth</span>(<span class="variable">$linkColor</span>,<span class="number">2</span>)</span><br><span class="line"> }</span><br><span class="line">}</span><br><span class="line"></span><br><span class="line">//css style</span><br><span class="line"></span><br><span class="line">a { color: <span class="hexcolor">#08c</span>;</span> }</span><br><span class="line"><span class="tag">a</span><span class="pseudo">:hover</span> { <span class="attribute">color</span><span class="value">: <span class="hexcolor">#333</span>;</span> }</span><br></pre></td></tr></table></figure></p>
<h5 id="map"><a href="#map" class="headerlink" title="map"></a>map</h5><p>map数据以key和value成对出现,其中value又可以是list。格式为:$map:(key1:value,key2:value2,key3:value3)。可以通过map-get($map,$key)取值。map数据还有更多函数具体参见[sass function][<a href="http://sass-lang.com/documentation/Sass/Script/Functions.html" target="_blank" rel="external">http://sass-lang.com/documentation/Sass/Script/Functions.html</a>]<br><figure class="highlight xquery"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br></pre></td><td class="code"><pre><span class="line"><span class="variable">$heading</span>:(h1:<span class="number">2</span>em,h2:<span class="number">1.5</span>em,h3:<span class="number">1.2</span>em);</span><br><span class="line">//使用</span><br><span class="line">@each <span class="variable">$header</span>,<span class="variable">$size</span> <span class="keyword">in</span> <span class="variable">$heading</span>{</span><br><span class="line"> #{<span class="variable">$header</span>}{</span><br><span class="line"> font-size:<span class="variable">$size</span>;</span><br><span class="line"> }</span><br><span class="line">}</span><br><span class="line">//css</span><br><span class="line">h1 { font-size: <span class="number">2</span>em; }</span><br><span class="line">h2 { font-size: <span class="number">1.5</span>em; }</span><br><span class="line">h3 { font-size: <span class="number">1.2</span>em; }</span><br></pre></td></tr></table></figure></p>
<h3 id="u5D4C_u5957"><a href="#u5D4C_u5957" class="headerlink" title="嵌套"></a>嵌套</h3><p>&表示本身</p>
<p>选择器嵌套<br><figure class="highlight less"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br></pre></td><td class="code"><pre><span class="line"><span class="class">.header</span>{</span><br><span class="line"> <span class="attribute">width</span>:<span class="number">1000px</span>;</span><br><span class="line"> <span class="attribute">margin</span>:<span class="number">0</span> auto;</span><br><span class="line"> <span class="attribute">position</span>:relative;</span><br><span class="line"> <span class="class">.logo</span>{</span><br><span class="line"> <span class="attribute">position</span>:absolute;</span><br><span class="line"> <span class="attribute">left</span>:<span class="number">0</span>;</span><br><span class="line"> <span class="attribute">top</span>:<span class="number">0</span></span><br><span class="line"> }</span><br><span class="line">}</span><br></pre></td></tr></table></figure></p>
<p>属性嵌套</p>
<p>###@at-root跳出嵌套</p>
<figure class="highlight less"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br></pre></td><td class="code"><pre><span class="line"><span class="class">.header</span>{</span><br><span class="line"> <span class="attribute">width</span>:<span class="number">100%</span>;</span><br><span class="line"> <span class="variable">@at-root</span>{</span><br><span class="line"> <span class="class">.nav</span>{</span><br><span class="line"></span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
<p>@at-root 和&一起可以在交换选择器嵌套<br><figure class="highlight less"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br></pre></td><td class="code"><pre><span class="line"><span class="class">.parents</span>{</span><br><span class="line"> <span class="attribute">background</span>:<span class="hexcolor">#fff</span>;</span><br><span class="line"> <span class="variable">@at-root</span> .child &{</span><br><span class="line"> <span class="attribute">background</span>:<span class="hexcolor">#000</span>;</span><br><span class="line"> }</span><br><span class="line">}</span><br></pre></td></tr></table></figure></p>
<p>@at-root只能跳出选择器嵌套。不能跳出@medio或@support,需要跳出@media和@support时使用@at-root(without:media)。常用@media,@support兼容性有问题。</p>
<p>###mixin 混合用$mixin:定义。@include 引用混合。<br><figure class="highlight xquery"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br></pre></td><td class="code"><pre><span class="line"><span class="variable">$mixin</span> font-dpr(<span class="variable">$fontsize</span>){</span><br><span class="line"> font-size:<span class="variable">$fontsize</span>;</span><br><span class="line">}</span><br><span class="line">.header{</span><br><span class="line"> @include font-dpr(<span class="number">14</span>px);</span><br><span class="line">}</span><br><span class="line"></span><br><span class="line">//编译结果</span><br><span class="line">.header{</span><br><span class="line"> font-size:<span class="number">14</span>px;</span><br><span class="line">}</span><br></pre></td></tr></table></figure></p>
<h3 id="u7EE7_u627F_@extend"><a href="#u7EE7_u627F_@extend" class="headerlink" title="继承 @extend"></a>继承 @extend</h3><p>@extend 样式块引用。<br><figure class="highlight less"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag">h1</span>{</span><br><span class="line"> <span class="attribute">font-size</span>:<span class="number">16px</span>;</span><br><span class="line"> <span class="attribute">line-height</span>:<span class="number">1.5</span>;</span><br><span class="line">}</span><br><span class="line"><span class="class">.article</span>{</span><br><span class="line"> <span class="variable">@extend</span> h1;</span><br><span class="line">}</span><br></pre></td></tr></table></figure></p>
<h3 id="25_u5B9A_u4E49_u7AD9_u4F4D_u9009_u62E9_u5668"><a href="#25_u5B9A_u4E49_u7AD9_u4F4D_u9009_u62E9_u5668" class="headerlink" title="%定义站位选择器"></a>%定义站位选择器</h3><p>这种选择器的优势是,在你不调用的时候不会有css文件。这样避免了定义大量的基础样式,却又有很大一部分没有使用的情况<br>可以定义基础样式,当样式内容引用了基础样式的时候sass才会加载渲染<br><figure class="highlight less"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br></pre></td><td class="code"><pre><span class="line">%<span class="tag">ir</span>{</span><br><span class="line"> <span class="attribute">color</span>:transparent;</span><br><span class="line"> <span class="attribute">text-shadow</span>:<span class="number">0</span>;</span><br><span class="line"> <span class="attribute">background-color</span>:transparent;</span><br><span class="line"> <span class="attribute">border</span>:<span class="number">0</span>;</span><br><span class="line">}</span><br><span class="line">%<span class="tag">clearfix</span>{</span><br><span class="line"> <span class="variable">@if</span> $lte7{</span><br><span class="line"> *<span class="attribute">zoom</span>:<span class="number">1</span>;</span><br><span class="line"> }</span><br><span class="line"> &:after,</span><br><span class="line"> &:before{</span><br><span class="line"> <span class="attribute">content</span>:<span class="string">""</span>;</span><br><span class="line"> <span class="attribute">display</span>:table;</span><br><span class="line"> <span class="attribute">font</span>:<span class="number">0</span>/<span class="number">0</span> a;</span><br><span class="line"> }</span><br><span class="line"> &after{</span><br><span class="line"> <span class="attribute">clear</span>:both;</span><br><span class="line"> }</span><br><span class="line"> <span class="attribute">clear</span>:both;</span><br><span class="line"> <span class="attribute">content</span>:<span class="string">''</span>;</span><br><span class="line">}</span><br><span class="line"></span><br><span class="line"><span class="id">#header</span>{</span><br><span class="line"> <span class="tag">h1</span>{</span><br><span class="line"> <span class="variable">@extend</span> %ir;</span><br><span class="line"> <span class="attribute">width</span>:<span class="number">300px</span>;</span><br><span class="line"> }</span><br><span class="line">}</span><br><span class="line"><span class="class">.ir</span>{</span><br><span class="line"> <span class="variable">@extend</span> %ir;</span><br><span class="line">}</span><br><span class="line"><span class="comment">//css style</span></span><br><span class="line"><span class="id">#header</span> <span class="tag">h1</span>{</span><br><span class="line"> <span class="attribute">color</span>:transparent;</span><br><span class="line"> <span class="attribute">text-shadow</span>:<span class="number">0</span>;</span><br><span class="line"> <span class="attribute">background-color</span>:transparent;</span><br><span class="line"> <span class="attribute">border</span>:<span class="number">0</span>;</span><br><span class="line"> <span class="attribute">width</span>:<span class="number">300px</span>;</span><br><span class="line">}</span><br></pre></td></tr></table></figure></p>
<h3 id="u51FD_u6570@function"><a href="#u51FD_u6570@function" class="headerlink" title="函数@function"></a>函数@function</h3><p>主要使用颜色函数,加深和减淡。</p>
<p>###运算<br>sass具有运算的特性,可以对数值的Value(如:数字、颜色、变量等)进行加减乘除四则运算。运算符前后需要添加空格进行运算,不然会出错。<br><figure class="highlight"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"></span><br><span class="line"></span><br></pre></td></tr></table></figure></p>
<h3 id="u6761_u4EF6_u5224_u65AD_u53CA_u5FAA_u73AF"><a href="#u6761_u4EF6_u5224_u65AD_u53CA_u5FAA_u73AF" class="headerlink" title="条件判断及循环"></a>条件判断及循环</h3><h4 id="@if"><a href="#@if" class="headerlink" title="@if"></a>@if</h4><p>@if可以单独使用,也可以结合@else多条件使用</p>
<h4 id="u4E09_u76EE_u8FD0_u7B97"><a href="#u4E09_u76EE_u8FD0_u7B97" class="headerlink" title="三目运算"></a>三目运算</h4><p>语法为:if($condition,@if_true,@if_false)。三个参数分别表示条件,条件为真的值,和条件为假的值。<br><figure class="highlight livecodeserver"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">if</span>(<span class="constant">true</span>,<span class="number">1</span>px,<span class="number">2</span>px) =><span class="number">1</span>px</span><br><span class="line"><span class="keyword">if</span>(<span class="constant">false</span>,<span class="number">1</span>px,<span class="number">2</span>px) =><span class="number">2</span>px</span><br><span class="line"></span><br><span class="line"><span class="comment">#### for循环</span></span><br><span class="line">循环有两种形式分别为:@<span class="keyword">for</span> $var <span class="built_in">from</span> <<span class="built_in">start</span>> through <<span class="keyword">end</span>> 和 @<span class="keyword">for</span> $var <span class="built_in">from</span> <<span class="built_in">start</span>> <span class="built_in">to</span> <<span class="keyword">end</span>>;$var 表示变量,<span class="built_in">start</span>表示起始值,<span class="keyword">end</span>表示结束值,两者的区别是关键词through表示包括<span class="keyword">end</span>这个数,而<span class="built_in">to</span>则不包括<span class="keyword">end</span>这个数。</span><br><span class="line"></span><br><span class="line"><span class="comment">#### each循环</span></span><br><span class="line">语法为:@<span class="keyword">each</span> $var <span class="operator">in</span> <list <span class="operator">or</span> map>。其中$var 表示变量list和map分别表示list类型数据和map类型数据。</span><br></pre></td></tr></table></figure></p>
<p>$animal-list:puma,sea-slug,egret,salmander;<br>@each $animal in $animal-list{<br> .#{$animal}-icon{<br> background-image:url(‘/images/#{animal}.png’);<br> }<br>}<br>//css style<br>.puma-icon{<br> background-image:url(‘/images/puma.png’);<br>}<br>.sea-slug{<br> background-image:url(‘/images/sea-slug.png’);<br>}<br>.egret{<br> background-image:url(‘/images/egret.png’);<br>}<br>.salmander{<br> background-image:url(‘/images/salmander.png’);<br>}<br>```</p>
<h4 id="u591A_u4E2A_u5B57_u6BB5list_u5FAA_u73AF"><a href="#u591A_u4E2A_u5B57_u6BB5list_u5FAA_u73AF" class="headerlink" title="多个字段list循环"></a>多个字段list循环</h4><h4 id="u591A_u4E2A_u5B57_u6BB5map_u6570_u636E_u5FAA_u73AF"><a href="#u591A_u4E2A_u5B57_u6BB5map_u6570_u636E_u5FAA_u73AF" class="headerlink" title="多个字段map数据循环"></a>多个字段map数据循环</h4>
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JavaScript 数据类型
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<p>javascript中有基本类型null,undefined,Number,string,boolean,和引用类型对象Object;</p>
<p>JavaScript是松散类型,可以采用typeof来</p>
<h2 id="Undefined_u7C7B_u578B"><a href="#Undefined_u7C7B_u578B" class="headerlink" title="Undefined类型"></a>Undefined类型</h2><p>undefined类型只有一个值即undefined。在使用var定义变量但未对其初始化时,此时变量的值就为undefined。</p>
<figure class="highlight delphi"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">var</span> <span class="keyword">message</span>;</span><br><span class="line">alert(<span class="keyword">message</span>==undefined); <span class="comment">//true</span></span><br></pre></td></tr></table></figure>
<p>包含未经定义值的变量和未定义的变量两者是不一样的。<br><figure class="highlight actionscript"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">var</span> message;</span><br><span class="line">alert(<span class="keyword">typeof</span> message);<span class="comment">//undefined;</span></span><br><span class="line">alert(age);<span class="comment">//产生错误;</span></span><br><span class="line">alert(<span class="keyword">typeof</span> age);<span class="comment">//undefined</span></span><br></pre></td></tr></table></figure></p>
<p>上面可以看到当未被初始化的变量获取其数据类型时,此时是undefined。</p>
<h2 id="Null_u7C7B_u578B"><a href="#Null_u7C7B_u578B" class="headerlink" title="Null类型"></a>Null类型</h2><p>Null数据类型只包含唯一的值即null;在初始化变量值时候,常将不需要设置值得时候显性的设置为null;</p>
<figure class="highlight actionscript"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">var</span> car=<span class="literal">null</span>;</span><br><span class="line">alert(car);<span class="comment">//null</span></span><br><span class="line">alert(<span class="keyword">typeof</span> car);<span class="comment">//Object;</span></span><br><span class="line">alert(car==<span class="literal">undefined</span>);<span class="comment">//true</span></span><br></pre></td></tr></table></figure>
<p>需要注意的一点是,typeof null的数据类型显示object;null是一个空对象指针,所以显示为一个object;<br>实际上undefined值是派生自null,ECMA-262规定两者相等操作符为true;null和undefined虽然==true;当两者用法完全不同。</p>
<h2 id="boolean_u7C7B_u578B"><a href="#boolean_u7C7B_u578B" class="headerlink" title="boolean类型"></a>boolean类型</h2><p>boolean类型即两个字面量:true和false;<br>这两个值与数字值是不一样的true不一等等于1;false也不一定等于0;<br><figure class="highlight kotlin"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"><span class="variable"><span class="keyword">var</span> found</span>=<span class="literal">true</span>;</span><br><span class="line"><span class="variable"><span class="keyword">var</span> lost</span>=<span class="literal">false</span>;</span><br></pre></td></tr></table></figure></p>
<p>Boolean类型区分大小写,True,和False都不是布尔值,是标识符;<br>boolean类型的转换:任何一个数据类型的值调用Boolean()函数的时候,总会返回一个Boolean值。</p>
<figure class="highlight kotlin"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br></pre></td><td class="code"><pre><span class="line"><span class="variable"><span class="keyword">var</span> found</span>=<span class="literal">true</span>;</span><br><span class="line">alert(<span class="typename">Boolean</span>(found));<span class="comment">//ture</span></span><br><span class="line"><span class="variable"><span class="keyword">var</span> str</span>=<span class="string">""</span>;</span><br><span class="line">alert(<span class="typename">Boolean</span>(str));<span class="comment">//false空字符串布尔值转化为false</span></span><br><span class="line"><span class="variable"><span class="keyword">var</span> strs</span>=<span class="string">"asdf"</span>;</span><br><span class="line">alert(<span class="typename">Boolean</span>(strs));<span class="comment">//true非空字符串</span></span><br><span class="line"><span class="variable"><span class="keyword">var</span> num</span>=<span class="number">10</span>;</span><br><span class="line">alert(<span class="typename">Boolean</span>(num));<span class="comment">//true任何非零数字值</span></span><br><span class="line"><span class="variable"><span class="keyword">var</span> arr</span>=[];</span><br><span class="line">alert(<span class="typename">Boolean</span>(arr));<span class="comment">//true任何对象</span></span><br><span class="line"><span class="variable"><span class="keyword">var</span> a</span>=<span class="literal">null</span>;</span><br><span class="line">alert(<span class="typename">Boolean</span>(a));<span class="comment">//false null转换为false</span></span><br></pre></td></tr></table></figure>
<p>在流程控制语句中会自动执行相应的Boolean转换规则。</p>
<figure class="highlight cmake"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line">var <span class="keyword">message</span>=<span class="string">"hello world"</span>;</span><br><span class="line"><span class="keyword">if</span>(<span class="keyword">message</span>){</span><br><span class="line"> alert(<span class="string">"value is ture"</span>);</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
<h2 id="Number_u7C7B_u578B"><a href="#Number_u7C7B_u578B" class="headerlink" title="Number类型"></a>Number类型</h2><p>二进制、十进制、十六进制、八进制等数字类型。八进制的第一位必须为0,然后八进制的序列是0-7;如果数字学列超出了范围,那么前导0将被忽略,当做十进制解析。十六进制字面值前两位必须为0x,后面跟字面0-9、a-f的。其中a-f可以大写也可以小写。<br><figure class="highlight kotlin"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"><span class="variable"><span class="keyword">var</span> intnum</span>=<span class="number">55</span> <span class="comment">//整数</span></span><br><span class="line"><span class="variable"><span class="keyword">var</span> octalNum1</span>=<span class="number">070</span> <span class="comment">//八进制的56;</span></span><br></pre></td></tr></table></figure></p>
<h3 id="u6D6E_u70B9_u6570_u503C"><a href="#u6D6E_u70B9_u6570_u503C" class="headerlink" title="浮点数值"></a>浮点数值</h3><p>javascript中并没有规定特殊的浮点数类型。浮点数值内存空间为整数数值的两倍<br><figure class="highlight kotlin"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line"><span class="variable"><span class="keyword">var</span> floatNum</span>=<span class="number">1.1</span>;</span><br><span class="line"><span class="variable"><span class="keyword">var</span> floatNum1</span>=<span class="number">0.1</span>;</span><br><span class="line"><span class="variable"><span class="keyword">var</span> floatNum2</span>=<span class="number">.1</span>;</span><br><span class="line"><span class="variable"><span class="keyword">var</span> floatNum3</span>=<span class="number">1.0</span>;</span><br></pre></td></tr></table></figure></p>
<p>如果小数点后为0,那么将会转换为整数。</p>
<p>对于极大和极小的数值,可以采用科学计数法e表示浮点数。表示方法为前面一个数值,中间为小写或大写的e,后面是10的幂指数。<br><figure class="highlight kotlin"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line"><span class="variable"><span class="keyword">var</span> floatnum</span>=<span class="number">1.2e3</span>;<span class="comment">//等于12000;</span></span><br></pre></td></tr></table></figure></p>
<p>浮点数计算的时候不准确性:0.1+0.2的值为0.30000000000000004,这个小小的误差会到导致无法测试特定的浮点数值。<br><figure class="highlight gcode"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">if</span><span class="comment">(a+b==0.3)</span>{<span class="comment">//我要这么做</span></span><br><span class="line"> alert<span class="comment">("you got 0.3")</span></span><br><span class="line">}</span><br></pre></td></tr></table></figure></p>
<h3 id="u6570_u503C_u8303_u56F4"><a href="#u6570_u503C_u8303_u56F4" class="headerlink" title="数值范围"></a>数值范围</h3><p>数值有一定的大小范围,多数浏览器中这个是是5e-324;大多数浏览器中Number.MAX_VALUE和Number.MIN_VALUE保存了最大和最小的数值。<br>要想确定一个数值是否在-Infinity和Infinity中间,可以使用isFinite()函数。这个函数在参数在最小值和最大值之间会返回true;</p>
<p>###NaN<br>NaN非数值。这个数值表示在本来要返回一个数值的操作未返回的情况。NaN不等于任何数值。NaN也不等于本身。任何涉及NaN操作都返回NaN;任何数除以0都返回NaN。<br><figure class="highlight stylus"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="title">alert</span><span class="params">(NaN==NaN)</span></span> <span class="comment">//false</span></span><br></pre></td></tr></table></figure></p>
<p>isNaN()函数,函数接受一个参数,可以是任何类型,函数帮我们确定参数是否是“不是数字”,不是数字返回true。<br>isNan()函数也适用对象。当一个对象作为参数的时候,会先调用对象的valueOf(),然后确认其参数是否可以转换为数值,如果不能则调用toString()方法进行转换。</p>
<h3 id="u6570_u503C_u8F6C_u6362"><a href="#u6570_u503C_u8F6C_u6362" class="headerlink" title="数值转换"></a>数值转换</h3><p>数值转换的基本规则是:<br>a、如果是Boolean值,true和false分别转换为1和0.<br>b、null和undefined返回0。<br>c、如果传入的是数值,则返回这个数值。<br>d、如果是字符串则:<br> 1.字符串只包含数字,如“123”则返回整数。<br> 2.字符串中含浮点格式“1.1”,返回浮点数值。<br> 3.包含十六进制,“ox”则转换为十进制整数值。<br> 4.空字符串转化为0。<br> 5.其余的则转换为NAN。<br>数值转化中有三个基本函数。Number()、parseInt()、pareseFloat(),分别为转换任何数据类型、转换为整数和浮点数据累心。常见制定第二个参数类型为10是很有必要的。</p>
<h2 id="String_u7C7B_u578B"><a href="#String_u7C7B_u578B" class="headerlink" title="String类型"></a>String类型</h2><h2 id="u7EC4_u6210"><a href="#u7EC4_u6210" class="headerlink" title="组成"></a>组成</h2><p>String类型是由多个16位的Unicode组成。</p>
<h2 id="u8F6C_u4E49_u5B57_u7B26"><a href="#u8F6C_u4E49_u5B57_u7B26" class="headerlink" title="转义字符"></a>转义字符</h2><p>常见的\n,\b,\r,\等。换行、空格、回车、斜杠等。<br>字符串可以由str.length获得其长度。当字符串中包含双字节字符,length可能不会反悔准确的字符数目。</p>
<p>##字符串拼接<br>字符串一旦创建就无法改变。所以当需要改变字符串值得时候需要重新赋值改变。<br><figure class="highlight kotlin"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"><span class="variable"><span class="keyword">var</span> lang</span>=<span class="string">"java"</span>;</span><br><span class="line">lang=lang+<span class="string">"script"</span>;</span><br></pre></td></tr></table></figure></p>
<p>##转换为字符串<br>toString()方法可以将每一个值转换为相应的字符串表现。toString以十进制返回数值的字符串表示。当传入2/8/10/16时能够以相应的进制表示字符串。</p>
<h2 id="Object_u7C7B_u578B"><a href="#Object_u7C7B_u578B" class="headerlink" title="Object类型"></a>Object类型</h2><p>Object类型是一组数据和功能的集合。</p>
<p>每个Object都有下列属性和方法。<br>1、constructor–构造函数,保存着当前对象的函数。<br>2、hasOwnProperty–用于检查给定的属性在当前实例中是否存在。<br>3、<br>4、<br>5、toString()<br>6、valueOf()</p>
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【学习】基于用户行为的图片等资源预加载
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<p>直接看demo<br><a href="http://blog.leewr.com/demo/tab-image-preload/tab-image-preload.html" target="_blank" rel="external">demo</a></p>
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jQuery输入字数监听
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<p>项目中有一个需求需要监听textarea中文字的输入个数。我们采用的jq框架,元素绑定input事件做到监听。然而这个中间有一个问题就是当你采用中文输入发的时候,当你输入拼音时候数值也发生了变化。无法正确监听中文的字数。<br>查看<a href="http://blog.leewr.com/demo/jqinput.html" target="_blank" rel="external">demo</a>。<br><figure class="highlight xquery"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line">ele.bind(<span class="string">'input'</span>,<span class="keyword">function</span>(){</span><br><span class="line"> <span class="variable">$counter</span>.text($(this).val().lenght)</span><br><span class="line">})</span><br></pre></td></tr></table></figure></p>
<p>当我们在textarea中拼音输入的时候,事件监听了每一个输入,而不是正确的中文汉字长度。</p>
<p>幸运的是我们发现了</p>
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<figure class="highlight swift"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">var</span> touchFunc=function(obj,type,<span class="func"><span class="keyword">func</span>)</span>{</span><br><span class="line"> <span class="keyword">var</span> <span class="keyword">init</span>={</span><br><span class="line"> x:<span class="number">5</span>,</span><br><span class="line"> y:<span class="number">5</span>,</span><br><span class="line"> sx:<span class="number">0</span>,</span><br><span class="line"> sy:<span class="number">0</span>,</span><br><span class="line"> ex:<span class="number">0</span>,</span><br><span class="line"> ey:<span class="number">0</span></span><br><span class="line"> }</span><br><span class="line"> <span class="keyword">var</span> type=type.toLowerCase();</span><br><span class="line"> <span class="keyword">var</span> sTime=<span class="number">0</span>,eTime=<span class="number">0</span>;</span><br><span class="line"></span><br><span class="line"> obj.addEventListener(<span class="string">"touchstart"</span>,function(){</span><br><span class="line"> sTime= new <span class="type">Date</span>().getTime();</span><br><span class="line"> <span class="keyword">init</span>.sx=event.targetTouches[<span class="number">0</span>].pageX;</span><br><span class="line"> <span class="keyword">init</span>.sy=event.targetTouches[<span class="number">0</span>].pageY;</span><br><span class="line"> <span class="keyword">init</span>.ex=<span class="keyword">init</span>.sx;</span><br><span class="line"> <span class="keyword">init</span>.ey=<span class="keyword">init</span>.sy;</span><br><span class="line"> <span class="keyword">if</span> (type.indexOf(<span class="string">"start"</span>)!=-<span class="number">1</span>) <span class="func"><span class="keyword">func</span><span class="params">()</span></span>;</span><br><span class="line"> },<span class="literal">false</span>);</span><br><span class="line"> obj.addEventListener(<span class="string">"touchmove"</span>,function(){</span><br><span class="line"> event.preventdefault();</span><br><span class="line"> <span class="keyword">init</span>.ex=event.targetTouches[<span class="number">0</span>].pageX;</span><br><span class="line"> <span class="keyword">init</span>.ey=event.targetTouches[<span class="number">0</span>].pageY;</span><br><span class="line"> <span class="keyword">if</span> (type.indexOf(<span class="string">"move"</span>)!=-<span class="number">1</span>) <span class="func"><span class="keyword">func</span><span class="params">()</span></span>;</span><br><span class="line"> },<span class="literal">false</span>);</span><br><span class="line"> obj.addEventListener(<span class="string">"touchend"</span>,function(){</span><br><span class="line"> <span class="keyword">var</span> changeX=<span class="keyword">init</span>.ex-<span class="keyword">init</span>.sx;</span><br><span class="line"> <span class="keyword">var</span> changeY=<span class="keyword">init</span>.ey-<span class="keyword">init</span>.sy;</span><br><span class="line"> <span class="keyword">if</span>(<span class="type">Math</span>.<span class="built_in">abs</span>(changeX)><span class="type">Math</span>.<span class="built_in">abs</span>(changeY)&&<span class="type">Math</span>.<span class="built_in">abs</span>(changeY)><span class="keyword">init</span>.y){</span><br><span class="line"> <span class="comment">//左右事件</span></span><br><span class="line"> <span class="keyword">if</span>(changeX><span class="number">0</span>){</span><br><span class="line"> <span class="keyword">if</span>(type.indexOf(<span class="string">"left"</span>)!=-<span class="number">1</span>) <span class="func"><span class="keyword">func</span><span class="params">()</span></span>;</span><br><span class="line"> }<span class="keyword">else</span>{</span><br><span class="line"> <span class="keyword">if</span>(type.indexOf(<span class="string">"right"</span>)!=-<span class="number">1</span>) <span class="func"><span class="keyword">func</span><span class="params">()</span></span>;</span><br><span class="line"> }</span><br><span class="line"> }<span class="keyword">else</span> <span class="keyword">if</span>(<span class="type">Math</span>.<span class="built_in">abs</span>(changeX)<<span class="type">Math</span>.<span class="built_in">abs</span>(changeY)&&<span class="type">Math</span>.<span class="built_in">abs</span>(changeX)><span class="keyword">init</span>.x){</span><br><span class="line"> <span class="comment">//上下事件</span></span><br><span class="line"> <span class="keyword">if</span>(changeY><span class="number">0</span>){</span><br><span class="line"> <span class="keyword">if</span>(type.indexOf(<span class="string">"top"</span>)!=-<span class="number">1</span>) <span class="func"><span class="keyword">func</span><span class="params">()</span></span>;</span><br><span class="line"> }<span class="keyword">else</span>{</span><br><span class="line"> <span class="keyword">if</span>(type.indexOf(<span class="string">"down"</span>)!=-<span class="number">1</span>) <span class="func"><span class="keyword">func</span><span class="params">()</span></span>;</span><br><span class="line"> }</span><br><span class="line"> }<span class="keyword">else</span> <span class="keyword">if</span>(<span class="type">Math</span>.<span class="built_in">abs</span>(changeX)<<span class="keyword">init</span>.x&&<span class="type">Math</span>.<span class="built_in">abs</span>(changeY)<<span class="keyword">init</span>.y){</span><br><span class="line"> eTime=new <span class="type">Date</span>().getTime();</span><br><span class="line"> <span class="comment">//点击事件,此处根据事件差细分</span></span><br><span class="line"> <span class="keyword">if</span>((eTime-sTime)><span class="number">300</span>){</span><br><span class="line"> <span class="keyword">if</span>(type.indexOf(<span class="string">"long"</span>!=-<span class="number">1</span>)) <span class="func"><span class="keyword">func</span><span class="params">()</span></span>;<span class="comment">//长按</span></span><br><span class="line"> }<span class="keyword">else</span>{</span><br><span class="line"> <span class="keyword">if</span> (type.indexOf(<span class="string">"click"</span>)!=-<span class="number">1</span>) <span class="func"><span class="keyword">func</span><span class="params">()</span></span>;<span class="comment">//当点击事件</span></span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line"> },<span class="literal">false</span>)</span><br><span class="line">}</span><br><span class="line">`</span><br></pre></td></tr></table></figure>
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<p>我们经常看到用一个元素模拟的三角形,相信你也已经知道了其中的技术方法。简单来说就是利用<br><figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line">width:<span class="number">0</span>px;</span><br><span class="line">height:<span class="number">0</span>px;</span><br><span class="line">border</span><br></pre></td></tr></table></figure></p>
<p>的方法来模拟三角行。</p>
<p>那么我们要模拟一个具体尺寸的三角形时候,这个三角形是怎么算出来的呢?</p>
<h3 id="u5927_u8FB9_u6846_u4EA7_u751F_u68AF_u5F62"><a href="#u5927_u8FB9_u6846_u4EA7_u751F_u68AF_u5F62" class="headerlink" title="大边框产生梯形"></a>大边框产生梯形</h3><p>我们看下面的样式</p>
<pre><code>.box{
width: 200px;
height: 200px;
background: #efefef;
border:20px solid #ddd;
border-top:20px solid #000;
text-align:center;
line-height: 200px;
}
</code></pre><h2 id="u4E09_u89D2_u5F62_u5C3A_u5BF8_u7684_u8BA1_u7B97"><a href="#u4E09_u89D2_u5F62_u5C3A_u5BF8_u7684_u8BA1_u7B97" class="headerlink" title="三角形尺寸的计算"></a>三角形尺寸的计算</h2><p>我们知道border为20px;那么他的斜边就为20√2 px;<br>当一个元素的宽和高都为0的时候,那么三角形的斜边就为相邻边宽度平方和的开根号。</p>
<p>那么当我们设定,上右下左的border宽度分别为 80px 120px 200px 60px,他构造出来的三角形是什么样子的呢?<br>利用三角形的勾股定理我们能够简单的计算出三角行的形状。这里就不计算了,我们因此能够得到不同角度的三角形,或者线条。</p>
<p>简而言之,就是上下边框的宽度等于左右三角形的底边,左右三角形的宽度等于上下三角形的底边,三角形的高度为各自边框的高度。</p>
<p>最后您可以看这里,我写了几个方向的三角形,up、left、right、bottom、left top、top right等。</p>
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