iboss_wx_app/package-base-select/pages/web-view-select/web-view-select.js

const config = require('@/config/config.js');
const util = require('@/utils/util.js')
const app = getApp()

Page({

  /**
   * 页面的初始数据
   */
  data: {
    url: null,
    filePath: null
  },

  /**
   * 生命周期函数--监听页面加载
   */
  onLoad(options) {
    // 获取文件 的uuid
    let uuid = util.getGuid()
    this.setData({
      uuid: uuid
    })
    // 接收父页面传递的参数
    const eventChannel = this.getOpenerEventChannel();
    if (eventChannel && JSON.stringify(eventChannel) !== '{}') {
      let that = this;
      // 指定类型
      eventChannel.once('url', function (data) {
        that.setData({
          url: data + '&uuid=' + uuid
        })

        var timesRun = 0;
        var interval = setInterval(function () {
          timesRun += 1;
          if (timesRun > 10 || that.data.filePath) {
            clearInterval(interval);
          } else {
            let path = 'pdf/' + that.data.uuid + '.pdf'
            that.downloadFile(`${config.image_url}/${path}`)
          }
        }, 2000);
      })
    }
  },
  /**
   * 下载文件资源到本地 打开文档 
   * @param {*} url 
   */
  downloadFile(url) {
    let that = this
    wx.downloadFile({
      url: url,
      fileType: 'pdf',
      success: function (resd) {
        if(resd.statusCode == 200){
          const filePath = resd.tempFilePath
          // 说明有值
          if (filePath) {
            that.setData({
              filePath: filePath
            })
            wx.navigateBack({
              delta: 1,
            })
            // 如果有值就打开文档
            wx.openDocument({
              filePath: filePath,
              showMenu: true,
              fileType: 'pdf',
              success: function (reso) {
              }
            })
          }
        }
      }, fail(err) {
      }
    })
  },
})