一、数组合并
var arr1 = [1,2,3,4];
var arr2 = [4,5,6,7,8];

var arr = arr1.concat(arr2); //合并数组
console.log(arr); //将set集合转化为数组
// 1,2,3,4,4,5,6,7,8

var arrNew= new Set(arr); //通过set集合去重
// 1,2,3,4,5,6,7,8

二、数组对象合并

var json1=[
{id:1,name:“aaa”},
{id:2,name:“bbb”},
{id:3,name:“ccc”},
]
var json2=[
{id:1,name:“ccc”},
{id:2,name:“ddd”},
{id:4,name:“eee”},
]

var json = json1.concat(json2); //两个数组对象合并

console.log(json)
// {id:1,name:“aaa”},{id:2,name:“bbb”},{id:3,name:“ccc”},{id:3,name:“ccc”},{id:4,name:“ddd”},{id:5,name:“eee”},

var json = json1.concat(json2); //两个数组对象合并

   function  newJson(json) {
            let newJson = []; //盛放去重后数据的新数组
            for(item1 of json){  //循环json数组对象的内容
                let flag = true;  //建立标记，判断数据是否重复，true为不重复
                for(item2 of newJson){  //循环新数组的内容
                    if(item1.id==item2.id){ //让json数组对象的内容与新数组的内容作比较，相同的话，改变标记为false
                        flag = false;
                if(flag){ //判断是否重复
                    newJson.push(item1); //不重复的放入新数组。  新数组的内容会继续进行上边的循环。
            return newJson;
console.log(newJson(json));
 // {id:1,name:“aaa”},{id:2,name:“bbb”},{id:3,name:“ccc”},{id:4,name:“ddd”},{id:5,name:“eee”},
                                    let aWithOverrides = { ...a, x: 1, y: 2 };
let aWithOverrides = { ...a, ...{ x: 1, y: 2 } };
let x = 1, y = 2, aWithOverrides = { ...a, x, y };
let aWithOverrides = Object.assign({}, a, { x: 1, y: 2 });
        { name: "tony", id: "1", age: "20" },
        { name: "jack", id: "2", age: "21" },
        { name: "tony", id: "3", age: "50" },
        { na...
                                    javascript数组去重利用数组的Array.prototype.indexOf来为数组对象扩展一个快速去重的方法。直接上代码：if(!Array.prototype.unique){
    Array.prototype.unique = function() {
        var a = [];//定义一个临时数组
        for (var i = 0; i < this.l
function ArrSet(Arr: any[], id: string): any[] {
    let obj: Object = {}
    const arrays = Arr.reduce((setArr, item) => {
        obj[item[id]] ? '' : (obj[item[id]] = true && setArr.push(item))
        return setArr
    }, [])