diff --git a/index.js b/index.js
index 59d6c84..ebfcdbf 100644
--- a/index.js
+++ b/index.js
@@ -1,3 +1,7 @@
+const pending = 'pending'
+const fulfilled = 'fulfilled'
+const rejected = 'rejected'
+
 function myPromise(constructor) {
   let self = this;
 
@@ -10,13 +14,20 @@ function myPromise(constructor) {
   function resolve(value) {
 
     // TODO resolve如何改变状态及返回结果
+    if (self.status === pending) {
+      self.status = fulfilled
+      self.value = value
+    }
 
   }
 
   function reject(reason) {
 
     // TODO reject如何改变状态及返回结果
-
+    if (self.status === pending) {
+      self.status = rejected
+      self.reason = reason
+    }
   }
 
   //捕获构造异常
@@ -36,6 +47,8 @@ function myPromise(constructor) {
 myPromise.prototype.then = function (onFullfilled, onRejected) {
 
   //TODO then如何实现
-
+  if (this.status === fulfilled) onFullfilled(this.value)
+  
+  if (this.status === rejected) onRejected(this.reson) 
 }
 module.exports = myPromise