<!DOCTYPE html>
<html>
<head lang="en">
<meta charset="UTF-8">
<title></title>
</head>
<body>
<script>
//简单数据类型无法绑定属性和方法
var str = "abc";
var strObj = new String("abc");
strObj.aaa = 111;
console.log(strObj);
console.log(typeof strObj);
console.log(strObj.aaa);
str.aaa = 111;
console.log(str.aaa);
console.log(str.length);
console.log(str.indexOf("c"));
</script>
</body>
</html>

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