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@@ -0,0 +1,51 @@
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+<!DOCTYPE html>
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+<html lang="en">
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+<head>
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+ <meta charset="UTF-8">
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+ <meta name="viewport" content="width=device-width, initial-scale=1.0">
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+ <title>Document</title>
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+</head>
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+<body>
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+
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+ <script>
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+ // Math.random()
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+ // var obj = {
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+ // name: "张三",
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+ // age: 18,
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+ // }
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+
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+ // var arr = [1,2,3,4];
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+ // var arr = new Array(1,2,3,4);
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+ // var arr = new Array(10);
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+ // console.log(arr);
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+ // var obj = {
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+ // name: "张三",
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+ // }
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+ // var obj1 = new Object()
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+
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+ // var obj = {
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+ // name: "张三",
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+ // age: 18,
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+ // sex: "男",
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+ // talk:function(){
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+
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+ // }
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+ // }
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+ // obj.age = 20;
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+ // obj.school = "黑大";
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+ // delete obj.age;
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+
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+ // obj = null;
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+ // console.log(obj);
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+
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+ // console.log(Math.PI);
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+
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+ // var str = new String();
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+ var str = "hello world";
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+ // console.log(str[1]);
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+ console.log(str.charAt(1));
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+
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+
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+ </script>
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+</body>
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+</html>
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