<script>
    export default {
        data() {
            return {
                floorData0: {},
                floorData1: {},
                floorData2: {},
            }
        },
        props:['floorData'],
        watch:{
            floorData:val => {
                console.log(this.floorData);
                this.floorData0 = this.floordata[0];
                this.floorData1 = this.floordata[1];
                this.floorData2 = this.floordata[2];
            }
        }
    }
</script>

在floorData傳值成功的前提下，有時(shí)候會(huì)出現(xiàn)直接在 watch 里面通過(guò) this.floorData 是無(wú)法拿到的，總是顯示 undefined。然后需要通過(guò) newVal和oldVal這么處理，才能拿到 floorData 的值：

        watch:{
            floorData:(newVal,oldVal) => {
                console.log(newVal);
                this.floorData0 = newVal[0];
                this.floorData1 = newVal[1];
                this.floorData2 = newVal[2];
            }
        }