我这里有两个分享的button 
转发的内容不一样，可以在onShareAppMessage 判断来自哪个button吗？我试了data-xx， 但是options.target里没有xx

<van-button type="primary" size="normal" open-type='share'>分享1</van-button>
<van-button type="primary" size="normal"  open-type='share'>分享2</van-button>

onShareAppMessage: function( options ) {
    console.log(options)
    if (options.from === 'button1') {
      return {
        title: '有个位置发给你！',
      }      
    } else if(options.from === 'button2') {
        return { 
          title: 'fjji'
      }
    }  
  },