javascript基础--如何检测NaN 

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

<head>
    <meta charset="UTF-8">
    <title>Document</title>
    <script>
        var a = parseInt('abc');
        var b = parseInt('sdf');
        //alert(a == b); //false
        // alert(a == NaN); //false
        //isNaN(值)
        alert(isNaN(a)); //true
    </script>
</head>

<body>

</body>

</html>

 

posted @ 2017-02-27 16:11  Mr_W_Blog  阅读(314)  评论(0)    收藏  举报