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es6、7、8、9新语法新特性-总结
source link: https://juejin.im/post/5c6629a3f265da2dd638dfa1
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1、let和const命令let命令，用来声明变量。它的用法类似于var，但是所声明的变量，只在let命令所在的代码块内有效。{ let a = 10; var b = 1; } a // ReferenceError: a is not defin
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