javascript交换值最好三种

代码

1. 位运算(性能高，但只能用于整数)

var a=15;
var b=32;
console.log(a)  //15
console.log(b)  //32
a = a ^ b; 
b = a ^ b;  
a = a ^ b; 
console.log(a)  //32
console.log(b)  //15

2. 数组结构(性能高，但要ES6+)

var a=15;
var b=32;
console.log(a)  //15
console.log(b)  //32
[a,b]=[b,a]
console.log(a)  //32
console.log(b)  //15

3. 加减法(性能低)

var a=15;
var b=32;
console.log(a)  //15
console.log(b)  //32
a = a + b;
b = a - b;
a = a - b;
console.log(a)  //32
console.log(b)  //15