iview timpicker 时间选择限制（时间线下一个时间不能早于上一个时间）

<TimePicker type="time" 
   :disabled-hours="disabledHours(index)" 
   :disabled-minutes="disabledMin(index)" 
   :disabled-seconds="disabledSeconds(index)" 
   placeholder="请选择时间" v-model="item.time" style="width: 300px">TimePicker>

//配送点到达时间规范：当前配送点到达时间不能超过上一个配送点到达时间
        disabledHours(index){
            let preTime = index===0?'0:0:0':this.deliveryTimeList[index-1].time;
            let preHour = preTime=== ""?0:preTime.split(":")[0];
            let disabledArr=[];
            for (let i = 0; i<preHour; i++) {
               disabledArr.push(i);
            }
            return disabledArr;
        },
        disabledMin(index){
            let preTime = index===0?'0:0:0':this.deliveryTimeList[index-1].time;
            let preMin = preTime=== ""?0:preTime.split(":")[1];
            let disabledArr=[];
            for (let i = 0; i<preMin; i++) {
               disabledArr.push(i);
            } 
            return disabledArr;
        },
        disabledSeconds(index){
            let preTime = index===0?'0:0:0':this.deliveryTimeList[index-1].time;
            let preSecond = preTime=== ""?0:preTime.split(":")[2];
            let disabledArr=[];
            for (let i = 0; i<=preSecond; i++) {
               disabledArr.push(i);
            }
            return disabledArr;
        },