Wechat applet pages always report errors when sending values to the background. It turned out to be this pit!

Wechat applet Page value transfer to background event.currentTarget.dataset It must be followed by lowercase English , Do not use capital English , Otherwise, it will be wrong .

 <view class="goodsShow" bindtap="clickItem" wx:for="{
   {goodsShowList}}" wx:item="item" wx:key="key"   data-orderGoods="{
   {item}}" data-orderid="{
   {item._id}}">
 <view class="itemShow">{
   {item.goodsInfo[0].goodsName}}</view>
 </view>

data-ordeGoods="{ {item}}" Page upload value background ,data- It can be followed by upper or lower case English letters .

  clickItem: function (event) {
    var orderGoods = event.currentTarget.dataset.ordergoods
    console.log("orderGoods:", orderGoods)   
  },

event.currentTarget.dataset. It must be followed by lowercase English letters , It can be compared with data-orderGoods="{ {item}}" atypism , Of course, consistency is also right . Otherwise, the report will be wrong , Such as ：

 clickItem: function (event) {
   var orderGoods = event.currentTarget.dataset.orderGoods
     var goodsInfo = orderGoods.goodsInfo[0]
   console.log("goodsINfo:", goodsInfo)
   console.log("orderGoods:", orderGoods)   
 },

orderGoods: undefined The system doesn't recognize ！ ha-ha , The same as long as there is a capital word, it will report an error , Different as long as js If it is in lowercase, no error will be reported ！ What kind of pit is this ！ I'm always trapped in this place , Poo Tong ！