JavaScript +=赋值操作
var a = 3;
var b = 17;
var c = 12;
// Only modify code below this line
a += 12;
b += 9;
c += 7;温馨提示
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var a = 3;
var b = 17;
var c = 12;
// Only modify code below this line
a += 12;
b += 9;
c += 7;关闭