<button open-type="share">转发</button>

  onShareAppMessage: function (res) {
      var shareId= "12312312312";
      return {
        title: '自定义转发标题',
        path: '/pages/index/index?shareId=' + shareId,
        success: function (res) {
          // 转发成功
        },
        fail: function (res) {
          // 转发失败
        }
      }
  },