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| 各位前端jser，都来说一说自己了解的Javascript冷知识吧，在这里让这些冷知识逐渐发光发热！ | |
| 大家一起来补充啊... | |
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typeof对于定义了的变量但值为undefined的变量会输出undefined，而未定义的变量和定义后不赋值的变量都会输出undefined。