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                ## 一、let let用來聲明變量。它的用法類似于`var`,但是所聲明的變量,只在`let`命令所在的代碼塊內有效; ~~~javascript { let a = 10; var b = 1; } a // ReferenceError: a is not defined. b // 1 ~~~ ## 二、const `const`聲明一個只讀的常量。一旦聲明,常量的值就不能改變; ~~~javascript const PI = 3.1415; PI // 3.1415 PI = 3; // TypeError: Assignment to constant variable. ~~~
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