javascript 中的比较大小，兼 typeof()用法

javascript中的排序： 1.不同类型 比 类型 （字符串 > 数字）   2.同类型：（字符串  比 按字母顺序 ）（数字 比 大小）

测试：

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Javascript typeof</title>
</head>
<body>

<script type="text/javascript">
    var a = "11111";
    var b = "22222";
    var c = 22222;
    var str = 'string';

    var s1 = "abb";
    var s2 = "abcd";
    var s3 = "-";
    
    console.log('typeof', typeof a);
    console.log('typeof b', typeof b);  
    console.log('typeof c', typeof c);
    console.log('typeof b > typeof c', typeof b > typeof c);
    console.log('typeof a === typeof b', typeof a === typeof b);
    console.log('typeof a === typeof c', typeof a === typeof c);
    console.log('typeof a === str', typeof a === str);
    console.log('a-b', a-b);
    console.log('a-c', a-c);
    console.log('s1-s2', s1-s2);
    console.log('s1>s2 ?', s1>s2);
    console.log('s1<s2 ?', s1<s2);

    console.log('parseInt(s1)', parseInt(s3));
    console.log('parseFloat(s1)', parseFloat(s3));
    console.log('Number(s1)', Number(s3));

    console.log('a-0', a-0);
    console.log('s3-0', s3-0);

</script>
    
</body>
</html>
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Javascript typeof</title>
</head>
<body>

<script type="text/javascript">
    var a = "11111";
    var b = "22222";
    var c = 22222;
    var str = 'string';

    var s1 = "abb";
    var s2 = "abcd";
    var s3 = "-";
    
    console.log('typeof', typeof a);
    console.log('typeof b', typeof b);  
    console.log('typeof c', typeof c);
    console.log('typeof b > typeof c', typeof b > typeof c);
    console.log('typeof a === typeof b', typeof a === typeof b);
    console.log('typeof a === typeof c', typeof a === typeof c);
    console.log('typeof a === str', typeof a === str);
    console.log('a-b', a-b);
    console.log('a-c', a-c);
    console.log('s1-s2', s1-s2);
    console.log('s1>s2 ?', s1>s2);
    console.log('s1<s2 ?', s1<s2);

    console.log('parseInt(s1)', parseInt(s3));
    console.log('parseFloat(s1)', parseFloat(s3));
    console.log('Number(s1)', Number(s3));

    console.log('a-0', a-0);
    console.log('s3-0', s3-0);

</script>
    
</body>
</html>

 

输出结果：

 

posted @ 2017-03-23 15:15  驸马爷  阅读(314)  评论(0)  编辑  收藏  举报