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ES6核心，值得驻足花一天时间来学习
source link: https://juejin.im/post/5b6d6f8ae51d453509566974
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1.let 和 const 命令 在es5时，只有两种变量声明，var 和function。在es6中新增了四种let和const，以及另外两种声明import和class。 我们先讲解let和const,后续会补充import和class （1）let 我们
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