javascript 如何对两个数组进行比较

js比较两个数组对象,取出不同的值
var array1 = [ {“Num”: "A " },{“Num”: “B” }];
var array2 = [ {“Num”: "A ",“Name”: "t1 " }, {“Num”: “B”,“Name”: “t2”}, {“Num”: "C " ,“Name”: "t3 "}];
var result = [];
for(var i = 0; i < array2.length; i++){
var obj = array2[i];
var num = obj.Num;
var isExist = false;
for(var j = 0; j < array1.length; j++){
var aj = array1[j];
var n = aj.Num;
if(n == num){
isExist = true;
break;
}
}
if(!isExist){
result.push(obj);
}
}
console.log(result);