js作用域 

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
        "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
    <title>js作用域</title>
</head>
<body>
<!--在py中：模块，函数，类有自己的作用域-->
<script>
    c='beijing';
    f=function(){
        var c='shanghai';

        function inner(){
            console.log('456'+c);
        }
        return inner;

    };

    f()();
    function bar(){
        console.log('123'+c)}
    f=function(){
        c='shanghai';
        return bar;
    };
    f()()
    //运行结果；456shanghai
    //          123shanghai

</script>

</body>
</html>
posted @ 2020-02-08 14:56  Stary_tx  阅读(213)  评论(0)  编辑  收藏  举报