<!-- index.ttml -->
<view class="container">
  <button type="primary" bindtap="saveFile">保存文件到本地</button>
  <button type="primary" bindtap="getFile">获取文件信息</button>
</view>

// index.js
const url =
  "https://sf1-cdn-tos.douyinstatic.com/obj/microapp/frontend/download.png"
Page({
  data: {
    filePath: "",
  },
  saveFile() {
    tt.downloadFile({
      url,
      success: (res) => {
        console.log("临时文件下载成功,下载路径: " + res.tempFilePath)
        tt.saveFile({
          tempFilePath: res.tempFilePath,
          success: (data) => {
            tt.showModal({
              content: "临时文件保存成功",
              showCancel: false,
            })
            this.setData({
              filePath: data.savedFilePath,
            })
            console.log("文件保存在本地路径: " + data.savedFilePath)
          },
          fail: (res) => {
            tt.showModal({
              content: "临时文件保存失败",
              showCancel: false,
            })
          },
        })
      },
      fail: (res) => {
        console.log("下载失败: ", res.errMsg)
      },
    })
  },
  getFile() {
    if (!this.data.filePath) {
      return tt.showToast({
        title: "请先保存文件",
        icon: "none",
      })
    }
    tt.getFileInfo({
      filePath: this.data.filePath,
      digestAlgorithm: "md5",
      success: (data) => {
        // 成功回调返回的参数中,size属性为文件大小，以字节为单位
        tt.showModal({
          title: "文件信息:",
          content: "大小：" + data.size + "字节，md5：" + data.digest,
          showCancel: false,
        })
      },
      fail: (res) => {
        // 当 API 执行失败后调用, 预定义返回消息格式为${API_NAME}:fail
        console.log("API调用失败: " + res.errMsg, res)
        tt.showModal({
          content: "获取文件信息失败",
          showCancel: false,
        })
      },
      complete(res) {
        // 当 API 执行完成（无论成功或者失败）后都会调用, 预定义返回消息格式为${API_NAME}:ok / fail
        console.log("API调用完成: " + res.errMsg)
      },
    })
  },
})