如何使用ngrok+express解決微信介面調試問題

var express = require('express');
var crypto = require('crypto') //使用npm安装后引入，用来生成签名
var http = require('request') //express的中间件，使用npm安装，用来发出请求
var jsSHA = require('jssha')//jssha是微信官网提供的nodejs版本签名算法，可以去官网下载官网的sample包
var app = express();
app.use(express.static('./review'))
app.get('/weixin',function (req, res) {//这个get接口就是测试号填写的接口，用来响应微信服务器的请求
  var token = 'weixin' //注意这里填写token，与微信测试号申请时候填写的token要保持一致  
  var signature = req.query.signature;
  var timestamp = req.query.timestamp;  
  var nonce = req.query.nonce;  
  var echostr = req.query.echostr;  
   /* 加密/校验流程如下： */  
   //1. 将token、timestamp、nonce三个参数进行字典序排序  
   var array = new Array(token,timestamp,nonce);  
   array.sort();  
   var str = array.toString().replace(/,/g,"");   
  //2. 将三个参数字符串拼接成一个字符串进行sha1加密  
  var sha1Code = crypto.createHash("sha1");  
  var code = sha1Code.update(str,'utf-8').digest("hex");  
   //3. 开发者获得加密后的字符串可与signature对比，标识该请求来源于微信  
  if(code===signature){    
    res.send(echostr)  
  }else{
    res.send("error");
  } 
});
var server = app.listen(80, function () {
  var host = server.address().address;
  var port = server.address().port;
  console.log('Example app listening at http://%s:%s', host, port);
});

// noncestr生成var createNonceStr = function() {
  return Math.random().toString(36).substr(2, 15);
};
// timestamp时间戳生成var createTimeStamp = function () {
  return parseInt(new Date().getTime() / 1000) + '';
};
//获取tiket
var getTiket= function (data) { //通过access_token获取tiket
  return new Promise((reslove,reject)=>{
    http.get(`https://api.weixin.qq.com/cgi-bin/ticket/getticket?access_token=${data}&type=jsapi`,
     function(err,res,body){
       if(res.body.tiket){
        resoleve(res.body.ticket)
       }else{
        reject(err)
       }     })   })}
// 计算签名方法
var calcSignature = function (ticket, noncestr, ts, url) {//使用jssha
  var str = 'jsapi_ticket=' + ticket + '&noncestr=' + noncestr + '&timestamp='+ ts +'&url=' + url;
  shaObj = new jsSHA(str, 'TEXT');  return shaObj.getHash('SHA-1', 'HEX');
}
//返回给前端配置信息的post接口
app.post('/weixin',function(req,res,next){
   let appId = '******'
   let appSecret = '******'
   let url = `https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=${appId}&secret=${appSecret }`
   http.get(url, function (err, response, body) {
    getTiket(response.body).then(resolve=>{
     let tiket = resolve//tiket
     let nonceStr = createNonceStr()//随机字符串
     let timeStamp = createTimeStamp()//时间戳
     let signature = calcSignature(tiket,nonceStr,timeStamp,req.body.url)
     let obj = { //将前端需要的参数返回
      data:{
        appId:appId,
        timestamp:timeStamp,
        nonceStr:nonceStr,
        signature:signature
      } 
     } 
     res.end(JSON.stringify(obj))
    }).catch(err=>{})
     res.end(JSON.stringify(err))
   });})