小编And*_*ton的帖子

开始学习node.js和backbone.js,并使用TodoMVC示例作为我的向导.有几个部分我无法绕过头脑.见下文.

这是app.js.

var express = require('express')
  , http = require('http')
  , mongoose = require('mongoose')
  , models = require('./models')
  , routes = require('./routes')
  , app = express();

app.configure(function () {
  app.set('views', __dirname + '/views');
  app.set('view engine', 'jade');
  app.use(express.favicon());
  app.use(express.logger('dev'));
  app.use(require('stylus').middleware({ src: __dirname + '/public' }));
  app.use(express.static(__dirname + '/public'));
  app.use(express.bodyParser());
  app.use(express.methodOverride());
  app.use(app.router);
});

app.configure('development', function () {
  app.use(express.errorHandler());
});

routes.init(app);


mongoose.connect("127.0.0.1", "todomvc", 27017);

http.createServer(app).listen(3000);

console.log("Express server listening on port 3000");

Heres是./models:

var mongoose = require('mongoose'),

  TodoSchema = new mongoose.Schema({
    title: { 'type': …

我为我正在研究的项目编写了一个jQuery的快速自定义扩展.我很难理解我希望实现的自定义onChange方法中'this'的范围.如果省略我的代码中间我调用webservice,但如果你检查最后两个方法,你会看到我的问题所在.我想用所选的值更改调用updateDetails方法.但是,当在onchange事件中调用该方法时,我显然会失去"this"的范围,因为this.materialListResponse在此上下文中返回为undefined.任何帮助我理解这一点的帮助将不胜感激.

$.fn.appendMaterials = function (options) {

       this.options = options;

       //Set Default Options

       this.defaults = {

           typeID: '66E1320D-51F9-4900-BE84-6D5B571F9B80'

       };

       this.options = $.extend({}, this.defaults, options);

       //
       Code here to call web service and generate response XML
       //

       this.materialListResponse = $.xml2json(

       $.parseXML($(this.materialListWebservice()).find("GetMaterialTreeResponse").text())).Materials.Material;

       this.appendOptionString = function () {
           var i = 0;
           this.optionString = '<option>'
           for (i = 0; i < this.materialListResponse.length; i++) {
               this.optionString += '<option>' + this.materialListResponse[i].MaterialCode + '</option>';
           };

           this.append(this.optionString);

           return this;
       };

       this.appendOptionString();

       this.updateDetails = function () {
           for (i …