<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>字符串操作</title>
</head>
<body>
<script type="text/javascript">
//声明字符串
var str = '@ilove@You@';//
//获取字符串的长度
var len = str.length;
// /常用的方法
var res = str.trim('@');
//获取指定索引的字符 $str[] $str{}
var res = str.charAt(4);//char字符 at 在...地方
//strpos
var res = str.indexOf('o');
//strrpos
var res = str.lastIndexOf('o');
//连接字符串 + 想起arguments
var res = str.concat('verymuch',' and you???');
//截取字符串
var res = str.slice(2, 7);
var res = str.substring(2, 7);
//字符串拆分
var res = str.split('@');
// console.log(res);
//截取字符串
var res = str.substr(2, 4);
//大写转换
var res = str.toUpperCase();
//小写转换
var res = str.toLowerCase();
//字符串替换
var res = str.replace('love','like');
//
</script>
</body>
</html>