交换两个变量值的几种算法

一、添加临时变量（最常见）

var a = 1,
       b = 2,
       c;

c = a;
a = b;
b = c;

二、算数运算（仅限number类型）

var a = 3,
      b = 5;

a = a - b; // a = -2 , b = 5;
b = a + b; // a = -2, b = 3;
a = b - a; // a = 5, b = 3;

三、数组特性

var a = 1;
      b = 2;

a = [ a , b ];
b = a[ 0 ];
a = a[ 1 ];

四、ES6解构

let a = 3,
      b = 7;

[ a , b ] = [ b , a ];

原文地址：https://www.cnblogs.com/lmyxywy/p/10988974.html