watch: {
    id (val) {
      let query = this.$router.history.current.query;
      let path = this.$router.history.current.path;
      //对象的拷贝
      let newQuery = JSON.parse(JSON.stringify(query));
      // 地址栏的参数值赋值
      newQuery.id = val;
      this.$router.push({ path, query: newQuery });
    }
  },