数组中多条对象去重方式

let log = console.log.bind(console);
let person = [
{id: 0, name: "小明"},
{id: 1, name: "小张"},
{id: 2, name: "小李"},
{id: 3, name: "小孙"},
{id: 1, name: "小周"},
{id: 2, name: "小陈"},
];

let obj = {};

person = person.reduce((cur,next) => {
obj[next.id] ? "" : obj[next.id] = true && cur.push(next);
return cur;
},[]) //设置cur默认类型为数组，并且初始值为空的数组
log(person);

 

 

var oldArr = [
    {id:1,name:"zhangs",age:18,contact_id:1},
    {id:1,name:"zhangs",age:18,contact_id:2},
    {id:1,name:"zhangs",age:18,contact_id:3},
    {id:1,name:"zhangs",age:18,contact_id:14},
    {id:1,name:"zhangs",age:18,contact_id:3},
    {id:1,name:"zhangs",age:18,contact_id:2},
    {id:1,name:"zhangs",age:18,contact_id:1}
];//原数据数组
var allArr = [];//新数组

1.该方法为jquery方法

$.each(oldArr,function(i,v){
    var flag = true;
    if(allArr.length > 0){
        $.each(allArr,function(n,m){
            if(allArr[n].contact_id == oldArr[i].contact_id){flag = false;};
        });
    };
    if(flag){
        allArr.push(oldArr[i]);
    };
});

2.原生js方法

for(var i=0;i<oldArr.length;i++){
　　var flag = true;
　　for(var j=0;j<allArr.length;j++){
　　　　if(oldArr[i].id == allArr[j].id){
　　　　　　flag = false;
　　　　};
　　}; 
　　if(flag){
　　　　allArr.push(oldArr[i]);
　　};
};

 

 

 

 

 

 

常用的

for (var i = 0; i < self.tableDataUser.length; i++) {

　　if (self.radioUser.indexOf(self.tableDataUser[i].userId) > -1) {

　　　　params = self.tableDataUser[i];

　　}

}

return params;