利用Object.prototype.toString.call(val)判断数据类型
返回值会以下列形式返回：
1. null => "[object Null]"
2. undefined
=> "[object Undefined]"
3. true => "[object Boolean]"
4. 1 => "[object Number]"
5. '' => "[object String]"
6. [] => "[object Array]"
7. {} => "[object Object]"
8. function () {} => "[object Function]"
9. new Date() => "[object Date]"
10. /./ => "[object RegExp]"
11. Math
=> "[object Math]"
12. Math
.max() => "[object Number]"
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