清除每隔5000毫秒请求一次接口的定时器（需求：每当我手动核销电子码，页面上的显示数据要实时更新到）

 import * as electron from "@/api/serverData/getServerData";
methods:{

        electron(){   //请求接口数据

            var that = this;
            let _data = {
                couponStatus : that.$route.params.status,
                mealType :  that.$route.params.type
            }
            electron.setCouponStatusList(_data).then(res => {
                //console.log(res)
                that.voucherList = res.data.coupon;

        }
    },
    mounted() {
        this.electron();
        timer = setInterval(this.electron, 5000);   //每隔5000毫秒请求一次接口
    },
    destroyed () {
        clearInterval(timer);    //清除定时器
    }