传智黑马39期WEB前端教程-JavaScript基础语法-JavaScript变量-交换两个变量

交换两个变量

实例

1. 交换两个变量的值

var n1 = 5;
var n2 = 6;
var tmp;
tmp = n1;
n1 = n2;
n2 = tmp;
console.log(n1, n2);

2. 不使用临时变量，交换两个数字变量的值

var n1 = 5;
var n2 = 6;
n1 = n1 + n2;//5 + 6 = 11 
n2 = n1 - n2;//11 - 6 = 5
n1 = n1 - n2;//11 - 5 = 6