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                # 1、定義常量 JS中定義常量,只有const語法。 ``` const A= 123; //定義常量A并賦值 console.log(A); // 123 ``` # 2、常量作用域 常量的作用域,是常量所在的塊。(塊可以理解為大括號) ![](https://img.kancloud.cn/75/88/758870d6f50376944460e2ee8d16cc52_560x273.png)
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