[object array A and object array B take out different elements of ID and assign them to the new array]

An array of objects a And object array b Take out id Assign different elements to the new array

     var result = [];
      for(var i = 0; i < this.flowLoanForm.alreadyFlowLoanPiao.length; i++){
        var obj = this.flowLoanForm.alreadyFlowLoanPiao[i];
        var num = obj.id;
        var isExist = false;
        for(var j = 0; j < list.length; j++){
          var aj = list[j];
          var n = aj.id;
          if(n == num){
            isExist = true;
            break;
          }
        }
        if(!isExist){
          result.push(obj);
        }
      }
      // console.log(result);

      this.oldList = result