What are the uses of sort() method in js? The sort method in js implements sorting of arrays and object arrays (code attached)

The content of this article is about how to use the sort() method in js? The sort method in js implements the sorting of arrays and object arrays (code attached). It has certain reference value. Friends in need can refer to it. I hope it will be helpful to you.

The sort() method will change the original array, which is arranged in unicode order by default

1. The sort method in js implements array sorting

var arr = [2,3,13,17,4,19,1];
arr.sort() // [1, 13, 17, 19, 2, 3, 4]

If you want to sort the array according to size For sorting, you need to add a comparison function in the sort() method of js

var arr = [2,3,13,17,4,19,1];
arr.sort(function(a,b){ // 比较函数
    return b - a;    // 降序, 升序为 a - b 
})
console.log(arr) //  [19, 17, 13, 4, 3, 2, 1]

2. The sort method of js implements the sorting of object arrays

is similar to the usage in arrays

var arr = [
            { name:"小明", age:12 },
            { name:"小红", age:11 },
            { name:"小刚", age:15 },
            { name:"小华", age:13 }
        ];
        
function compare(p){ //比较函数
    return function(m,n){
        var a = m[p];
        var b = n[p];
        return a - b;
    }
}
arr.sort(compare("age"));
console.log(arr); 
//升序，结果： [{name: "小红", age: 11}, {name: "小明", age: 12}, {name: "小华", age: 13}, {name: "小刚", age: 15}]

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