JavaScript 交换两个变量的数值

• 方法一

let a = "a", b = "b";
console.log(a, b);
let t = a;
a = b;
b = t;
console.log(a, b);

• 方法二

let a = "a", b = "b";
console.log(a, b);
[a, b] = [b, a];
console.log(a, b);

• 方法三

let a = "a", b = "b";
console.log(a, b);
a = [b, b = a][0];
console.log(a, b);