微信小程序上实现下载pdf功能-526互联

    onLookFile() {
      let that = this;
      const filename = '下载附件'
      const fileExtName = ".pdf";
      const randfile = filename + fileExtName;
      //wx.env.USER_DATA_PATH 是微信提供了一个用户文件目录给开发者，开发者对这个目录有完全自由的读写权限
      const newPath = `${wx.env.USER_DATA_PATH}/${randfile}`;
      that.deletContract();
      wx.downloadFile({
        url: 'xxx', // 后端下载地址
        filePath: newPath,
        success: function (res) {
          const filePath = res.tempFilePath;
          console.log(filePath)
          wx.openDocument({
            filePath: newPath,
            showMenu: true,
            fileType: 'pdf',
          })
        },
        fail: function () {
          wx.hideLoading();
        }
      })
    },
    // 删除本地文件
    deletContract() {
      try {
        let file = wx.getFileSystemManager();
        file.readdir({
          dirPath: `${wx.env.USER_DATA_PATH}`,
          success: res => {
            console.log(res);
            if (res.files.length > 2) {
              file.unlink({
                filePath: `${wx.env.USER_DATA_PATH}/${res.files[0]}`,
              })
            }
          }
        })
      } catch (error) { }
    },