<text id='textId' data-userxxx='100' bindtap='tapMessage'>cilck here</text>

//index.js
Page({
 data: {
  mo: 'Hello World!!',
  userid : '1234',
 }, 
  // 定義函數(shù)
 tapMessage: function(event) {
  console.log(event.target.id);    // 可獲得
  console.log(event.target.name);   // 無法獲得, 通過target只能直接獲取id
  console.log(event.target.dataset); // 要獲得其它屬性, 需要從dataset(數(shù)據(jù)集)中獲取
  console.log(event.target.dataset.userxxx); // userxxx為自定義的屬性名, 但命名方式為:data-userxxx
  
  // 這里還原使用userXxx
  console.log(event.target.dataset.userXxx);
 }
})

       <!-- data-userXxx,這個大寫的X要改為-x -->
<text id='textId' data-user-xxx='100' bindtap='tapMessage'>cilck here</text>

<view bindtap='handout'>
  outer
  <view bindtap='handmiddle'>
   middle
   <view bindtap='handinner'>inner</view>
  </view>
 </view>

handout: function () {
 console.log("out");
},
handmiddle: function () {
 console.log("middle");
},
handinner: function () {
 console.log("inner");
}

 <view bindtap='handout'>
  outer
  <view catchtap='handmiddle'>
   middle
   <view bindtap='handinner'>inner</view>
  </view>
 </view>