数组去重的两种方式

1.双for循环

 // that.positions.map(train=>{
                            //     that.new_Positions.push( train.trainId)
                            // })
                            //     that.resultArr = [];//去重后的数组
                            //     var flag;
                            //     for (var i in that.new_Positions){
                            //         flag = true;
                            //         for (var j in that.resultArr) {
                            //             if (that.resultArr[j] == that.new_Positions[i]) {
                            //                 flag = false;
                            //                 break;
                            //             }
                            //         }
                            //         if (flag) {
                            //             that.resultArr.push(that.new_Positions[i]);
                            //         }
                            //     }
                            // console.log("that.resultArr:",that.resultArr)

2.  ... new set 方法

          let equipment=[]
          this.channelsList.map(item=>{
              equipment.push(item.equipmentId)
          })
          equipment = [...new Set(equipment)];
          console.log("equipment:",equipment)
          //结果：equipment: (2) ["157680812042523", "157680823318728"]