old_contents: const express = require('express');
  const router = express.Router();
  const crypto = require('crypto');
  
  /* GET home page. */
  router.get('/', function (req, res, next) {
    const weixinConfig = {
      id: 'wx718b667be9b708b2',
      secret: 'd61cc9e73723f413ce3af3d2ebfe202a',
      token: 'CAIDAMAODEXIAODANGAO',
      encodingAESKey: 'aawOE2hSzsniM43AAU2WsZbEEWRMJEzSe33Dy0Jcy8a',
      checkSignature: true
    };
  })
  .get('wxapi', configWXServer);
  
  function configWXServer(req, res, next) {
    try {
      const params = req.query;
      const TOKEN = weixinConfig.token;
      const signature = params.signature;
      const timestamp = params.timestamp;
      const nonce = params.nonce;
      const echostr = params.echostr;
      const tmpArr = [TOKEN, timestamp, nonce];
      const hash = crypto.createHash('sha1');
      const tmpStr = hash.update(tmpArr.sort().join('')).digest('hex');
      console.log(tmpStr, signature, '////////////////')
      if (tmpStr === signature) {
        res.send(echostr);
      } else {
        res.send(false);
      }
    } catch (e) { res.send(e); }
  }
  
  module.exports = router;
new_contents: const express = require('express');
  const router = express.Router();
  const crypto = require('crypto');
  
  /* GET home page. */
  router.get('/', function (req, res, next) {
    const weixinConfig = {
      id: 'wx718b667be9b708b2',
      secret: 'd61cc9e73723f413ce3af3d2ebfe202a',
      token: 'CAIDAMAODEXIAODANGAO',
      encodingAESKey: 'aawOE2hSzsniM43AAU2WsZbEEWRMJEzSe33Dy0Jcy8a',
      checkSignature: true
    };
  })
  .get('/wxapi', function (req, res, next) {
    try {
      const params = req.query;
      const TOKEN = weixinConfig.token;
      const signature = params.signature;
      const timestamp = params.timestamp;
      const nonce = params.nonce;
      const echostr = params.echostr;
      const tmpArr = [TOKEN, timestamp, nonce];
      const hash = crypto.createHash('sha1');
      const tmpStr = hash.update(tmpArr.sort().join('')).digest('hex');
      console.log(tmpStr, signature, '////////////////')
      if (tmpStr === signature) {
        res.send(echostr);
      } else {
        res.send(false);
      }
    } catch (e) { res.send(e); }
  });
  
  
  module.exports = router;
subject: edit hash