shareFileMessage使用过程中出现概率性有用，大概率性失效的问题。真机仿真结果如图

代码如下：

dataRowClick: function (e, id){
        var model = products_url[id-1].model;
        var statue = "已发布";
        if (products_url[id-1].url == 'null'){
          statue = "在研"
        }


        console.log(e);
        console.log(statue)
        var products_head_url ='cloud://cloud1-7gvpe9lfc973e8bc.636c-cloud1-7gvpe9lfc973e8bc-1316841949/CAD/';
        
        let fileID = products_head_url+model+'.dwg';
        console.log(fileID); // 打印文件链接
        if(statue == "在研"){
          wx.showToast({
            title: '未发布',
            duration:2000,
          });
          return;
        }
        wx.showLoading({
          title:'下载中',
          duration:1000
        });
        wx.cloud.downloadFile({
          fileID: fileID, // 使用文件链接
            success: function (res) {
            var fileName = fileID.split('/').pop()
            // wx.saveFile({
            //   tempFilePath: res.tempFilePath,
            //   filePath: wx.env.USER_DATA_PATH + '/' + fileName,
              
            //   success: function (res) {
            //     wx.showToast({
            //       title: '下载成功',
            //       icon:'success',
            //       duration:2000
            //     })
                
            //   }
              
            // })


            wx.shareFileMessage({
              filePath: res.tempFilePath,
              // filePath: wx.env.USER_DATA_PATH + '/' + fileName,
              
              success(data) {
                console.log('转发成功！！！',data)
              },
              fileName:fileName,
              fail: console.error,
            })
          }
        })
      },

dataRowClick绑定在表格的一行点击事件，用

 <view id='{{item[keyName].val}}' style="width:{{dataAreaWidth}}px;height:{{rowHeight}}px;" bindtap="dataRowClick">