js比较两个数组对象,取出不同的值

var array1 = [ {
"USER_ID": "1111",
"USER_NAME": "88881",
"TF_REMARK": "备注备注备注"
}, {
"USER_ID": "2222",
"USER_NAME": "88882",
"TF_REMARK": "这是一个备注"
}];
var array2 = [
{
"USER_ID": "1111",
"USER_NAME": "88881",
"TF_REMARK": "备注备注备注"
},
{
"USER_ID": "2222",
"USER_NAME": "88881",
"TF_REMARK": "备注备注备注"
},
{
"USER_ID": "3333",
"USER_NAME": "88882",
"TF_REMARK": "这是一个备注"
},
{
"USER_ID": "4444",
"USER_NAME": "8888",
"TF_REMARK": null
}
];
var result = [];
for(var i = 0; i < array2.length; i++){
var obj = array2[i];
var num = obj.USER_ID;
var flag = false;
for(var j = 0; j < array1.length; j++){
var aj = array1[j];
var n = aj.USER_ID;
if(n == num){
flag = true;
break;
}
}
if(!flag){
result.push(obj);
}
}
console.log(result);