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20、symbols #20

Description

@king-lxt

symbols 是一种无法被重建的基本类型。这时 symbols 有点类似与对象创建的实例互相不相等的情况,
但同时 symbols 又是一种无法被改变的基本类型数据。

作用:
1、Symbol 生成一个全局唯一的值。

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