onUpdate: function (e) {     var orderInfoList = this.data.orderInfoList;     var checked = true;     for(var i=0; i<orderInfoList.length; i++) {       if (orderInfoList[i].selected) {         if (orderInfoList[i].orderSize > orderInfoList[i].stockQuantity) {           wx.showToast({             icon: "none",             title: '商品库存数量不足哦',           })         }         wx.cloud.callFunction({           name: 'updateOrderByOrderID',           data: {             orderID: orderInfoList[i].orderID           }         }).then(async function (res){           // 商品表 库存数-订单数           console.log(orderInfoList[i].productID + "商品表 库存数-订单数")           wx.cloud.callFunction({             name: 'updateProductByID',             data: {               productID: orderInfoList[i].productID,               // 库存数 - 订单数               stockQuantity: orderInfoList[i].stockQuantity - orderInfoList[i].orderSize,             }           }).then(res =>{             wx.navigateTo({               url: '../order'             })           }).catch(err =>{             wx.showToast({               icon: "none",               title: '更新商品表失败',             })           })         }).catch(err =>{           wx.showToast({             icon: "none",             title: '更新订单表失败',           })         })          checked = false;       }     }     if (checked) {       wx.showToast({         icon: "none",         title: '要先选中商品哦',       })     }   }

数据： orders[{   clientID：1001   productID：10001 },{   clientID：1001   productID：10002 },{   clientID：1002   productID：10001 }] // 初期处理   data: {     editOrderInfoList:[{       clientID:'',       userName:'',       productList:[]     }]   } // onLoad处理 onLoad: function (options)     wx.cloud.callFunction({       name: 'searchAllOrder'     }).then( async function(res) {             const orders = res.result.data;       var clientIDList = [];       var j=0       for (let i = 0; i < orders.length; i++) {         if (clientIDList.indexOf(orders[i].clientID) < 0) {           // 客户信息           const clientResult = await db.collection('client').where({             clientID: orders[i].clientID           }).get()           clientIDList.push(orders[i].clientID);           _this.data.editOrderInfoList[j].clientID = clientResult.data[0].clientID;           _this.data.editOrderInfoList[j].userName = clientResult.data[0].userName;           j++;         } } 现象：J=1，clientID=1002的时候出异常，TypeError: Cannot read property 'clientID' of undefined 大概是”_this.data.editOrderInfoList[j].clientID“出问题，不知道怎么解决啦，大神们

// 云函数入口文件 const cloud = require('wx-server-sdk') cloud.init() const db = cloud.database()//打开数据库连接 // 云函数入口函数 exports.main = async (event, context) => {   const wxContext = cloud.getWXContext()   try{   db.collection("client").doc(event.id).update({     data: {       userName: event.userName,       alias: event.alias,       mobile: event.mobile,       address: event.address,       createTime: db.serverDate()     }   }) } catch (e) {   console.error('err:', e) } }