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JS Console Alert REPL 报错 变量 变量声明提升 数据类型 typeof
2022-07-21 22:04:00 【HandsomeDanielWu】
JS是弱类型编程语言，赋值什么类型，就是什么类型
alert
console
报错
syntax语法
REPL。evaluate
变量
变量声明提升
数据类型
typeof 
typeof是操作符，不是函数
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