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JavaScript --有关提升
source link: https://juejin.im/post/5bb76c00f265da0af407224a
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先有鸡还是先有蛋？ 当我们执行下面一段代码： a=2; var a; console.log(a); 复制代码他会输出什么呢？可能有部分人会认为是undefined，因为 var a 在 a=2 之后声明，所以会被重新赋值故为undefined。 But，告诉
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