如图：想要实现的效果，当点击了弹窗的确定按钮后更新数据库字段，在页面及时显示“顶”这个字，在代码中设置0：const wehicle = that.data.wehicles[0],就能够实现效果，如果设置为id，const wehicle = that.data.wehicles[id],就实现不了。这个id，是点击置顶按钮时的id值，这是什么原因呢？

       /**
     * 置顶弹窗
     */
    showCode(event) {
        console.log(event);
        const id = event.currentTarget.dataset.id
        console.log(id)
        this.setData({
            show_input: true,
            id: id
        })
    },

    // 获取input输入框
    getCodeValue(e) {
        this.setData({
            code: e.detail.value,
        })
    },
    // 关闭弹窗
    closeModal(e) {
        console.log(e);
        this.setData({
            show_input: false
        })
    },
    // 点击确定
    async confirm(e) {
        const that = this;
        const itmelength = that.data.code;
        const id = that.data.id;  // 点击弹窗按钮的id，
        const wehicle = that.data.wehicles[0]; // 传入0能够实现效果，当传入id时，就不能实现。
        console.log(wehicle)
        wx.showLoading({
            title: "正在置顶中..."
        })
        wx.cloud.callFunction({
           name: "topping",
           data: {
               id: id,
               itmelength: itmelength,
           },
           success: res => {
                console.log(res);
               const updated = res.result.stats.updated;
               if(!wehicle.topping){
                    wehicle.topping = [itmelength]
               }else{
                    wehicle.topping.push(itmelength)
               }
               const wehicles = that.data.wehicles;
               console.log(wehicles)
               wehicles[id] = wehicle
               console.log(wehicles[id]);
               that.setData({
                    wehicles:wehicles
               })
               if (updated) {
                  wx.hideLoading();
                  wx.showToast({
                     title: "恭喜！置顶成功！",
                  })
                  setTimeout(function () {
                     that.setData({
                        show_input: false,
                     })
                  }, 800)
               } else {
                  wx.showToast({
                     title: "置顶失败，请重新置顶！",
                  })
               }
            }
         })
    },