不用第三个变量实现a,b的值交换

不用第三个变量实现a,b的值交换

var a = 5, b = 3;

// 方一：用加减运算

a = a + b;//5+3=8

b = a - b;//8-3=5

a = a - b;//a-5=3

// 方二：用异或运算

// https://blog.youkuaiyun.com/cxu123321/article/details/105824817

a = a ^ b;

b = a ^ b;

a = a ^ b;

// 方三：解构

[a, b] = [b, a]