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ES6的Symbol竟然那么强大，面试中的加分点啊
source link: https://juejin.im/post/5bdbb3406fb9a022752c319e
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symbol是es6出的一种类型，他也是属于原始类型的范畴(string, number, boolean, null, undefined, symbol) basic let name = Symbol('xiaohesong') typeof name
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