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@@ -0,0 +1,62 @@
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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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+ <script>
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+ // Function Array Object ...
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+
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+ var str = "hello";
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+ var num = 10;
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+ var boo = true;
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+ var arr = [1,2];
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+ var obj = {a:1};
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+ var foo = function(){console.log(1)};
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+ var und = undefined;
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+ var nu = null;
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+
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+ // 方法一
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+ // console.log( typeof str );
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+ // console.log( typeof num);
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+ // console.log( typeof boo);
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+ // console.log( typeof arr);
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+ // console.log( typeof obj);
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+ // console.log( typeof foo);
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+ // console.log( typeof und);
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+ // console.log( typeof nu);
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+
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+ // 方法二
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+ // instanceof 只能判断 object array function
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+ // console.log( arr instanceof Array );
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+ // console.log( obj instanceof Object );
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+ // console.log( str instanceof String );
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+ // console.log( foo instanceof Function );
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+
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+ // 方法三
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+ // console.log(arr.constructor == Array)
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+ // console.log(str.constructor == String);
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+ // console.log(num.constructor == Number);
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+ // console.log(foo.constructor == Function);
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+ // console.log(obj.constructor == Object);
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+ // console.log(boo.constructor == Boolean);
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+
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+ // 方法四
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+ console.log( Object.prototype.toString.call(und) );
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+ console.log( Object.prototype.toString.call(nu) );
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+ console.log( Object.prototype.toString.call(str) );
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+ console.log( Object.prototype.toString.call(num) );
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+ console.log( Object.prototype.toString.call(foo) );
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+ console.log( Object.prototype.toString.call(boo) );
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+ console.log( Object.prototype.toString.call(arr) );
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+ console.log( Object.prototype.toString.call(obj) );
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+
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+
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+
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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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