let arr1 = [{id:'1',name:'json'},{id:'2',name:'book'} ]

let arr2 = [{id:'1',name:'json',age:'15'},{id:'2',name:'book',age:'16'},{id:'3',name:'ani',age:'17'}] 
 //ES6的方法 
let add = arr2.filter(item => !arr1.some(ele=>ele.id===item.id)); 
console.log(add); 
 
//ES5的方法 
for (var i=0; i<arr2.length; i++) { 
      for (var j=0; j<arr1.length; j++) {
             if (arr2[i].id == arr1[j].id) {
                  arr2.splice(i, 1); 
              } 
      }
 }
 
js 两个数组对比，去除相同项得到新数组
var arr1 = [a, b, c,];
var arr2 = [a, b, c, d];
let list = arr2.filter(items => {
if (!arr1.includes(items)) return items;
})
而上面的则是对字符串进行比较后去重