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  • 1小时前 · software

    我在 JavaScript 的第一步:简要解析

    JavaScript 中的变量 **let** 用于可以在以后更改的值。 ```javascript let age = 20; age = 21; ``` **const** 用于不应被更改的值。 ```javascript const PI = 3.14159; ```

    #javascript #variables #data-types #beginner-programming #web-development
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