javascript - How to swap the positions of two elements in a js array?

Question

Is there an easy way? Please give me more advice!

Answer 1

The easiest thing to think of is

  ` var temp = arr[i];
        arr[i] = arr[j];
        arr[j] = temp;`    或者就是利用字符串和数组的一些方法进行交换，上面也有人提到了。 

Answer 2

arr[i]=[arr[j], arr[j]=arr[i]][0]

Answer 3

ES6 can be as simple as
[a,b] = [b,a]

Answer 4

// 给你来个最经典的冒泡排序算法
var arr = [1,3,5,7,9,8,6,4,2];
for (let i = 0; i < arr.length; i++) {
    for (let j = i; j < arr.length; j++) {
        if (arr[i] < arr[j]) {
            // 后面这三行是调换位置的方法
            var temp = arr[i];
            arr[i] = arr[j];
            arr[j] = temp;
        }
    }
}
console.log(arr);

Answer 5

Isn’t it easy enough to use tmp? Then try this

let a=[1,2,3];
[a[1], a[2]]=[a[2], a[1]];

Answer 6

var a = [1,4,6,43,5,9,0,23,45];

    function change(arr,k,j) {
        var c = arr[k];

        arr[k] = arr[j];
        arr[j] = c;
        console.log(arr);
    }

    console.log(a);
    change(a,3,7);

Answer 7

let arr = [1, 2, 3, 4, 5]
// 交换第三个和第四个元素
// x < y
let x = 3, y = 4

arr.splice(x - 1, 1, ...arr.splice(y - 1, 1, arr[x - 1]))
console.log(arr) /// [1,2,4,3,5]