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)
  }
  })
 }
 })
 }
 },