freeCodeCamp/guide/chinese/certifications/javascript-algorithms-and-data-structures/basic-javascript/decrement-a-number-with-javascript/index.md

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Decrement a Number with JavaScript	使用JavaScript减少数字

使用JavaScript减少数字

使用' - '运算符减少数字：

var a = 5; 
 a--; // Now, 'a' is 4 
 --a; // Now, 'a' is 3