downloadAnnex(url){         let _this = this;         let fileName = url.split('/');         let downloadTask = wx.downloadFile({             url: api.download+url,             success: function (res) {                 // 只要服务器有响应数据，就会把响应内容写入文件并进入 success 回调，业务需要自行判断是否下载到了想要的内容                 var filePath = res.tempFilePath;                 let manager = wx.getFileSystemManager();  //获取全局唯一的文件管理器                 //判断目录是否存在                 manager.access({                     path: `${wx.env.USER_DATA_PATH}/download`,                     //存在目录则查看是否存在此文件                       success: (res) => {                         manager.access({                             path: `${wx.env.USER_DATA_PATH}/download/${fileName[2]}`,                             // 存在文件则展示                             success(res) {                                 Taro.openDocument({                                     filePath: `${wx.env.USER_DATA_PATH}/download/${fileName[2]}`,                                     fileType: 'docx',                                     success:(res)=>{                                         Taro.showToast({                                             title: '正在打开',                                             icon: 'success',                                             duration: 2000                                           })                                     },                                     fail:(err)=>{                                         Taro.showToast({                                             title: '打开失败',                                             duration: 2000                                         })                                       console.log('读取失败',err)                                     }                                   })                                 return false;                             },                             // 不存在文件则把缓存文件用saveFile另存为                             fail(err) {                                 manager.saveFile({                                     tempFilePath: filePath,     //filePath为保存到本地的临时路径                                     filePath: `${wx.env.USER_DATA_PATH}/download/${fileName[2]}`,                                     success: (res) => {                                         Taro.openDocument({                                             filePath: `${wx.env.USER_DATA_PATH}/download/${fileName[2]}`,                                             fileType: 'docx',                                             success:(res)=>{                                                 Taro.showToast({                                                     title: '下载成功',                                                     icon: 'success',                                                     duration: 2000                                                   })                                             },                                             fail:(err)=>{                                                 Taro.showToast({                                                     title: '下载失败',                                                     duration: 2000                                                 })                                             }                                           })                                     },                                     fail: (err) => {                                         console.log(err)                                     }                                 })                             }                         })                     },                     //目录不存在则创建目录                     fail(err){                         manager.mkdir({                             dirPath: `${wx.env.USER_DATA_PATH}/download`,                             recursive: false, //是否在递归创建该目录的上级目录后再创建该目录。                             success: (res) => {                                 //创建目录成功后将临时文件保存到目录  /download                                 manager.saveFile({                                     tempFilePath: filePath,                                     filePath: `${wx.env.USER_DATA_PATH}/download/${fileName[2]}`,                                     success: (res) => {                                         Taro.openDocument({                                             filePath: `${wx.env.USER_DATA_PATH}/download/${fileName[2]}`,                                             fileType: 'docx',                                             success:(res)=>{                                               console.log('读取成功',res)                                             },                                             fail:(err)=>{                                               console.log('读取失败',err)                                             }                                           })                                     },                                     fail: (err) => {                                         console.log(err)                                       }                                 })                             }                         })                     }                 })             },             fail: (err)=>{                 console.log(err, "下载失败")             }         });     }

换了几台手机测试都一样