微信小程序实现文件预览

<button bindtap='preview'>简历预览</button>

 //简历预览
 preview: function () {
 var that = this;
 console.log("简历预览")
 
//这里的value是先在data里面初始化，然后我根据用户切换单选框，获取的简历文件的主键id
 console.log(this.data.value)
 var id = that.data.value;

 if (id == "") {
  wx.showModal({
  title: '',
  content: '请选择一份简历',
  showCancel: false,
  confirmColor: "#FFB100"
  })
 } else {

  //先通过简历的主键id,查询简历路径（大家可以根据自己的需求来传数据）
  wx.request({
  url: app.globalData.url + "/api/interview/queryFilePath",
  data: {
   id: id
  },
  method: 'POST',
  header: { "content-type": "application/x-www-form-urlencoded" },
  success: function (res) {
   console.log(res.data)
   that.setData({
   path: res.data.path,
   type: res.data.type
   })
   //下载简历
   wx.downloadFile({
   url: app.globalData.url + that.data.path,
   success: function (res) {
    var filePath = res.tempFilePath
    console.log(filePath)

    //预览简历
    wx.openDocument({
    filePath: filePath,
    fileType: that.data.type,
    success: function (res) {
     console.log("打开文档成功")
     console.log(res);
    },
    fail: function (res) {
     console.log("fail");
     console.log(res)
    },
    complete: function (res) {
     console.log("complete");
     console.log(res)
    }
    })
   },
   fail: function (res) {
    console.log('fail')
    console.log(res)
   },
   complete: function (res) {
    console.log('complete')
    console.log(res)
   }
   })
  }
  })
 }
 },