javascript中typeof方法Douglas Crockford的文章系列：http://www.crockford.com/javascript/本文章内容参
javascript中typeof方法
Douglas Crockford的文章系列：http://www.crockford.com/javascript/
本文章内容参考：http://javascript.crockford.com/survey.html
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对象类型typeof结果Object‘object’Array'object'Function'function'String'string'Number'number'Boolean'boolean'null'object'undefined'undefined'NaN'number'