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JS 底蕴之 变量、作用域和垃圾回收
source link: https://juejin.im/post/5b04fe58518825672f1a3aa3
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基本类型和引用类型 在 JavaScript 中，数据类型可分为基本类型和引用类型， 基本类型有六种：Null，Undefined，String，Boolean，Number，Symbol； 而引用类型就是传说中的 Object 了。 其中基本类型是按值传递
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