diff --git a/docs/iterator.md b/docs/iterator.md
index 3b47b83..9f4bcd6 100644
--- a/docs/iterator.md
+++ b/docs/iterator.md
@@ -29,15 +29,15 @@ it.next() // { value: "a", done: false }
 it.next() // { value: "b", done: false }
 it.next() // { value: undefined, done: true }
 
-function makeIterator(array){
+function makeIterator(array) {
   var nextIndex = 0;
   return {
-    next: function(){
+    next: function() {
       return nextIndex < array.length ?
         {value: array[nextIndex++], done: false} :
         {value: undefined, done: true};
     }
-  }
+  };
 }
 ```
 
@@ -52,15 +52,15 @@ function makeIterator(array){
 对于遍历器对象来说，`done: false`和`value: undefined`属性都是可以省略的，因此上面的`makeIterator`函数可以简写成下面的形式。
 
 ```javascript
-function makeIterator(array){
+function makeIterator(array) {
   var nextIndex = 0;
   return {
-    next: function(){
+    next: function() {
       return nextIndex < array.length ?
         {value: array[nextIndex++]} :
         {done: true};
     }
-  }
+  };
 }
 ```
 
@@ -74,14 +74,14 @@ it.next().value // '1'
 it.next().value // '2'
 // ...
 
-function idMaker(){
+function idMaker() {
   var index = 0;
 
   return {
-    next: function(){
+    next: function() {
       return {value: index++, done: false};
     }
-  }
+  };
 }
 ```
 
@@ -166,31 +166,31 @@ for (var value of range(0, 3)) {
 下面是通过遍历器实现指针结构的例子。
 
 ```javascript
-function Obj(value){
+function Obj(value) {
   this.value = value;
   this.next = null;
 }
 
-Obj.prototype[Symbol.iterator] = function(){
+Obj.prototype[Symbol.iterator] = function() {
   var iterator = {
     next: next
   };
 
   var current = this;
 
-  function next(){
-    if (current){
+  function next() {
+    if (current) {
       var value = current.value;
       var done = current.next === null;
       current = current.next;
       return {
         done: done,
         value: value
-      }
+      };
     } else {
       return {
         done: true
-      }
+      };
     }
   }
   return iterator;
@@ -204,7 +204,7 @@ one.next = two;
 two.next = three;
 
 for (var i of one){
-  console.log(i)
+  console.log(i);
 }
 // 1
 // 2