js 

<!DOCTYPE html>
<html lang="zh-cn">
<head>
    <meta charset="UTF-8" />
    <title>Document</title>
</head>
<body>

    <script>
    
function a(){

var d =100 ;

return function(){

　　return d++;

}

}

var b= a();
b();
b();
alert(b());
    
    
    
    
    
    
    
    </script>
</body>
</html>

 

 闭包函数..

 

Scope   

Closure  (a)    闭包

 

posted @ 2019-04-29 14:03  aladam  阅读(119)  评论(0)    收藏  举报