var a = 100;
var b = 200;
var t;
t = a;
a = b;
b = t;
//解构赋值的写法完成【ES6交换变量的值】
var x = 100;
var y = 200;
[x, y] = [y, x];
console.log(x);
console.log(y);
优点1:直观
优点2:一一对应
优点3:节省内存空间(不用多申请变量)