数组去除交集

    var self = this;
     var arr = this.myCartData.filter((item,index)=>{
       let flag = true;
       self.selection.forEach((item1,index1)=>{
           if(item1.id === item.id){
             self.count--;
             self.sum = self.sum - item.amount;
             flag = false;
           }
       })
       return flag;
     })
  this.myCartData = arr;