wxml:

<button open-type="share">分享</button>
<button bindtap="testShare">测试分享</button>

js:

  onShareAppMessage: function () {
    let title = 'title'
    let imageUrl = 'url'
    letlet path = '/pages/index/index?postId=' + this.data.post._id
    return { title, imageUrl, path }
  },
  testShare:function(){
    let path = '/pages/index/index?postId=' + this.data.post._id
    wx.navigateTo({
      url: path,
    })
  }