先调用downloadFile接口下载一个100多K的word文件，然后调用wx.openDocument打开这个文件，文件显示后3秒左右小程序闪退。代码如下

wx.downloadFile({
      url: url, 
      success (res) {
        console.log("########res:",res)
        let file = res.tempFilePath
         
          wx.openDocument({
            filePath: res.tempFilePath,
            showMenu:true,
            fileType:"doc",
            success:function (res) {
              console.log('打开文档成功')
            },
            fail:function (res) {
              wx.showToast({
                title:'打开失败',
                duration:2000
              })
            },
            complete:function (res) { 
              console.log(res);
            }
          }) 
      }
    })