node.js 微信

var crypto = require('crypto');
  app.get('/api/wx/test',function(req,res){
    if (req.query) {
      var arr = [];
      var signature = req.query["signature"];
      var timestamp = req.query["timestamp"];
      var nonce = req.query["nonce"];
      var echostr = req.query["echostr"];
      var token = 'tjntv';
      arr.push(token,timestamp,nonce);
      arr.sort();
      var str = arr.join('');
      var md5sum = crypto.createHash('sha1');
      str = md5sum.update(str);
      if ( str == signature ) {
        res.send(echostr);
      } else {
        console.log('22222222222222');
      }
    } else {
      console.log('11111111111111');
      return false;
    }
  });