The name of the variable cannot be the same
// 变量的交换的第一个思路:使用第三方的变量进行交换
var num1 = 10;
var num2 =20;
// 把num1这个变量的值取出来放在temp变量中
var temp = num1;
// 把num2的这个变量的值取出来放在num1变量中
num1 = num2;
// 把temp变量的值取出来放在num2变量中
num2 = temp;
//第二种交换:一般适用于数字的交换
var num1 = 10;
var num2 = 20;
//把num1的变量中的值和num2变量中的值取出来相加,重新赋值给num1这个变量
num1 = num1 + num2;
//把num1变量的值和num2变量的值取出来相减,相减的结果重新赋值给num2
num2 = num1 - num2;
//num1变量的值和num2变量的值取出来,相减的结果重新赋值给num1
num1 = num1 - num2;
console.log(num1);
console.log(num2);
There is another one that is not commonly used, and it is not very important to remember, just see it and know it.
//位运算(不常用)
var num1 = 10;
var num2 = 20;
num1 = num1^num2;
num2 = num1^num2;
num1 = num1^num2;
console.log(num1);
console.log(num2);