比较完整的数据类型安全检测方法

<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <title>比较完整的数据类型安全检测方法</title>
    <script src="test.js"></script>
    <script>
        var a = Math.abs;
        alert(typeOf(a));
        var a = null
        alert(typeOf(a));
        var a = "abc";
        alert(typeOf(a));
        var b = [1,2,3];
        alert(typeOf(b));
        var b = false;
        alert(typeOf(b));
    </script>
</head>
<body>
    
</body>
</html>

==========test.js==========

 1 //安全检测JavaScript基本数据类型和内置对象
 2 //参数：o表示检测的值
 3 /*返回值：返回字符串"undefined"、"number"、"boolean"、
 4 "string"、"function"、"regexp"、"array"、"date"、
 5 "error"、"object"或"null"
 6 */
 7 function typeOf(o){
 8     var _toString = Object.prototype.toString;
 9     //获取对象的toString()方法引用
10     //列举基本数据类型和内置对象类型，可以进一步补充该数组的检测数据类型范围
11     var _type = {
12         "undefined":"undefined",
13         "number":"number",
14         "boolean":"boolean",
15         "string":"string",
16         "[object Function]":"function",
17         "[object RegExp]":"regexp",
18         "[object Array]":"array",
19         "[object Date]":"date",
20         "[object Error]":"error"
21     }
22     return _type[typeof o]||_type[_toString.call(o)]||(o?"object":"null");
23 }

业精于勤荒于嬉，行成于思毁于随