js去除数组对象中的重复对象

var arr = [
    {id: 1, name: 'sli', year: 2012},
    {id: 2, name: 'ap', year: 2015},
    {id: 1, name: 'alslion', year: 2012},
    {id: 3, name: 'pose', year: 2012},
]
 
//删除arr中的重复对象
var newArr= [];
var arrId = [];
for(var item of arr){
    if(arrId.indexOf(item['id']) == -1){
        arrId.push(item['id']);
        newArr.push(item);
    }
}
console.log(arrId,newArr);