Sharing some js methods and skills

This article mainly shares some js method techniques with you, hoping to help you.

1. Quickly reorder an array

var arr = [1,2,3,4,5,6,7,8,9,10];
arr.sort(function(){ return Math.random-0.5 }) //无规则排序
arr.sort(function(a,b){ return a-b }) //从小到大
arr.sort(function(a,b){ return b-a }) //从大到小

2. Shorter array rewriting method

// 1.去除数组的重复成员（es6新增）
[...new Set(array)]

For example:

var arr= [2,"12",2,12,1,2,1,6,12,13,6];
arr=[...new Set(arr)];
console.log(arr)  //[2, "12", 12, 1, 6, 13]
//2. indexOf方法去重var arrN=[];for(var i=0;i<arr.length;i++){    if(arrN.indexOf(arr[i])<0){        arrN.push(arr[i])    }}
console.log(arrN) //[2, "12", 12, 1, 6, 13]
// 3.相邻数比较法（原理，先排序，一样大的会排在一起，这样一比较，删除相同的，有个问题就是数组必须是用一类型
否则，这样一个数组[1, 1, 12, "12", 12, 13, 2, 2, 2, 6, 6]，用以下方法 ==有7个值，===有5个值）
arr.sort();   for(var i=0;i<arr.length;i++){    if(arr[i]==arr[i+1]){        arr.splice(i,1);        i--;    }    } console.log(arr) //[2, "12", 12, 1, 6, 13]

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