判断元素类型JS 

 <!doctype html>
<html lang="en">

    <head>
        <meta charset="UTF-8" />
        <title>Document</title>
        <script type="text/javascript">
            console.log({}.toString.call(1));
            console.log({}.toString.call("11"));
            console.log({}.toString.call(/123/));
            console.log({}.toString.call({}));
            console.log({}.toString.call(function() {}));
            console.log({}.toString.call([]));
            console.log({}.toString.call(true));
            console.log({}.toString.call(new Date()));
            console.log({}.toString.call(new Error()));
            console.log({}.toString.call(null));
            console.log({}.toString.call(undefined));
            console.log(String(null));
            console.log(String(undefined));
        </script>
    </head>

    <body>

    </body>

</html>

 

posted @ 2017-12-28 19:05  进军码农  阅读(5121)  评论(0)    收藏  举报