微信小程序事件冒泡bindtap和catchtap

微信小程序bindtap和catchtap都是当用户点击该组件的时候会在该页面对应的Page中找到相应的事件处理函数。但是bind事件绑定不会阻止冒泡事件向上冒泡，catch事件绑定可以阻止冒泡事件向上冒泡。如：
catchtap:

<view id="outer" bindtap="handleTap1">
    outer view
    <view id="middle" catchtap="handleTap2">
    middle view
    <view id="inner" bindtap="handleTap3">
      inner view
    </view>
</view>
 
Page({
    handleTap1:function(event){  //点击输出outer view bindtap
      console.log("outer view bindtap")
    },
    handleTap2: function (event) {  //点击输出middle view
      console.log("middle view catchtap")
    },
    handleTap3: function (event) {  //点击输出inner view bindtap  middle view catchtap
      console.log("inner view bindtap")
    },
})

bindtap:

<view id="outer" bindtap="handleTap1">
    outer view
    <view id="middle" bindtap="handleTap2">
    middle view
    <view id="inner" bindtap="handleTap3">
      inner view
    </view>
</view>
 
Page({
    handleTap1:function(event){  //点击输出outer view bindtap
      console.log("outer view bindtap")
    },
    handleTap2: function (event) {  //点击输出outer view bindtap middle view
      console.log("middle view catchtap")
    },
    handleTap3: function (event) {  //点击输出outer view bindtap inner view bindtap  middle view catchtap
      console.log("inner view bindtap")
    },
})