创建string的方法
var str ="abc";
var str = new String("abc");
var str = String("abc');length 属性方法
indexOf replace charAt split
<html>
<head>
<script typt="text/javascript">
var str="abcdefghi";
alert(str);//abcdefghi
alert(str.charAt(0));//a
var str1="aaa";
var str2="bb";
var str3="cc";
alert(str1.concat(str1,str2,str3));//abbcc
alert(str1.indexOf("a",0));
alert(str.replace("a","lll"));
var arr = str.split("");
for(var i=0;i<arr.length;i++){alert(": "+arr[i]);}
</script>
</head>
<body>
</body>
</html>
substr boUpperCase toLowerCase
var str="abcdefghi"; alert(str.substr(0,2));//ab alert(str.substr(1,3));//bcd alert(str.toUpperCase());//ABCDEFGI alert(str.toLowerCase());//abcdefgi