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修改数据类型
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5 进阶/02-JavaScript数据类型.html

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Symbol (ECMAScript6新定义) 可以用来作为Object的key的值,也可以认为它是C里面的枚举类型
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1种复杂数据类型(引用类型)
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Object
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Array Date RegExp String Number Boolean Math null
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Array Date RegExp String Number Boolean Math (null)
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typeof 返回类型小写(number string boolean undefined object function)
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typeof返回值为string类型,引用类型中,除function的对象都是object类型

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