小程序中target与currentTarget区别

两者有点击目标事件的区别，代码如下

<view bindtap='del' data-id="1">
A
<view data-id="2">B</view>
<view>C</view>
</view>

del(e){
    console.log('currentTarget:',e.currentTarget.dataset.id)
    console.log('target:', e.target.dataset.id)
  },

点击A

currentTarget: 1
target: 1

点击B

currentTarget: 1
target: 2

点击C

currentTarget: 1
target: undefined

由上可以看出，currentTarget是冒泡事件，所有内部点击触发