freeCodeCamp/guide/chinese/certifications/javascript-algorithms-and-data-structures/basic-javascript/compound-assignment-with-augmented-addition/index.md

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Compound Assignment With Augmented Addition	具有增强加法的复合赋值

具有增强加法的复合赋值

计算机从左到右阅读。因此，使用'+ ='运算符意味着使用正确的数字添加变量，然后将变量分配给总和。像这样：

var a = 9; 
 a += 10; // Now, 'a' is equal to 19