javascript - 多次发出 Nodejs 事件

Question

我已经使用以下代码创建了我的模块 modulemy :

var request = require('request');
var EventEmitter = require('events').EventEmitter;
var User = new EventEmitter();
var userFbInfos = new EventEmitter();

//database and calls the get started conversation.
User['checkUserRegistered'] =  function (userID) {
    //if registered and have phone number then nothing to do otherwise, get user infos return it  and last ask his phonenumber
    //Now we consider that the user is not registered. So we get is infos
    userFbInfos.getInfos(userID);
    userFbInfos.on('gotten', function (err, userInfos) {
        User.emit('checked',err, userInfos);
    });

}

//This gets user info from Facebook and notifies when the information is gotten via event gotten
//The thing is as node is event driven if you request the user info and run a code before getting that info, the userinfos will be null.

userFbInfos['getInfos'] = function (userID) {
    request.get("https://graph.facebook.com/v2.6/" + userID + "?fields=first_name,last_name,locale,gender,timezone,profile_pic&access_token=" + process.env.page_token,
    function (err, response, body) {
        userFbInfos.emit('gotten',err,JSON.parse(body));
    });
}

exports.userFbInfos = userFbInfos;
exports.User = User;

然后在我的 app.js 中，我按如下方式使用它:

modulemy = require('./modulemy.js');
                        var user = modulemy.User;
                        //Checking if user is registered.
                        user.checkUserRegistered('123');
                        //This variable checks if the event was trigger before already to not execute the code twice.
                        var called = false;
                        user.on('checked', function (err, userInfos) {

                            if (!called){
                                console.log("Call Checked");
                                var name = "";
                                if (typeof (userInfos) != 'undefined') {
                                    name = userInfos['first_name'];
                                }
                               console.log("Yes you are there");
                                called = true;
                            }
                        });

问题是 checked 事件被多次触发...我不明白问题出在哪里...我需要帮助。

Answer 1

从 fb 接收包裹时可能会出现问题。如果来自查询的输入数据与之前来自查询的输入数据相同，则尝试向上计数一些变量。