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js typeof 判断变量的数据类型

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Release： 2016-06-01 09:55:03
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1. 'undefined' --- 这个值未定义； 2. 'boolean'    --- 这个值是布尔值；
3. 'string'        --- 这个值是字符串；
4. 'number'     --- 这个值是数值；
5. 'object'       --- 这个值是对象或null；
6. 'function'    --- 这个值是函数

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