两个数组比较

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));

cosnole.log(add);

//ES5的方法

for (var i=0; i

for (var j=0; j

if (arr2[i].id == arr1[j].id) {undefined

arr2.splice(i, 1);

}

}

}

注意上面删除的依据是数组中id字段，这个

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 => {undefined

if (!arr1.includes(items)) return items;

})

而上面的则是对字符串进行比较后去重

var arr1 = [a, b, c,];
var arr2 = [a, b, c, d];
let list = arr2.filter(items => {
if (!arr1.includes(items)) return items;
})
console.log(list);