我试图复制一个facebook messenger bot，但不断得到request is not defined。
与Facebook相同的代码：

function callSendAPI(messageData) {
  request({
    uri: 'https://graph.facebook.com/v2.6/me/messages',
    qs: { access_token: PAGE_ACCESS_TOKEN },
    method: 'POST',
    json: messageData

  }, function (error, response, body) {
    if (!error && response.statusCode == 200) {
      var recipientId = body.recipient_id;
      var messageId = body.message_id;

      console.log("Successfully sent generic message with id %s to recipient %s", 
        messageId, recipientId);
    } else {
      console.error("Unable to send message.");
      console.error(response);
      console.error(error);
    }
  });  
}

字符串
我的节点server.js看起来像这样：

const express = require('express');
const bodyParser = require('body-parser');
//const request = express.request;
const PAGE_ACCESS_TOKEN = 'abc';

let app = express();

app.use(bodyParser.urlencoded({ extended: false }));

// parse application/json
app.use(bodyParser.json());

[...]

function sendTextMessage(recipientId, messageText) {
  var messageData = {
    recipient: {
      id: recipientId
    },
    message: {
      text: messageText
    }
  };

  callSendAPI(messageData);
}

function callSendAPI(messageData) {..}

[...]

型
我是不是错过了什么快递？谢谢