javascript 中的比较大小，兼 typeof()用法
2024-09-01 15:14:42
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：
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