[url=]title.firstChild.data + '</a>');
}
},
showError: function(statusCode) {
this.display.clear();
this.display.append('Error fetching feed.');
},
stopUpdates: function() {
clearInterval(this.interval);
},
startUpdates: function() {
this.fetchFeed();
var that = this;
this.interval = setInterval(function() { that.fetchFeed(); },
this.conf.updateInterval * 1000);
}
};
/* FeedManager namespace. */
//工厂管理器，这里可以根据传进来的参数选择具体的Display
var FeedManager = {
createFeedReader: function(conf) {
var displayModule = new ListDisplay(conf.id + '-display', conf.parent);
Interface.ensureImplements(displayModule, DisplayModule);
var xhrHandler = XhrManager.createXhrHandler();
Interface.ensureImplements(xhrHandler, AjaxHandler);
return new FeedReader(displayModule, xhrHandler, conf);
}
};
=====================================================
另一个自行车工厂的例子：
var BicycleShop = function() {};
BicycleShop.prototype = {
sellBicycle: function(model) {
var bicycle = this.createBicycle(model);
bicycle.assemble();
bicycle.wash();
return bicycle;
},
createBicycle: function(model) {
throw new Error('Unsupported operation on an abstract class.');
}
};
/* AcmeBicycleShop class. */
var AcmeBicycleShop = function() {};
extend(AcmeBicycleShop, BicycleShop);
AcmeBicycleShop.prototype.createBicycle = function(model) {
var bicycle;
switch(model) {
case 'The Speedster':
bicycle = new AcmeSpeedster();
break;
case 'The Lowrider':
bicycle = new AcmeLowrider();
break;
case 'The Flatlander':
bicycle = new AcmeFlatlander();
break;
case 'The Comfort Cruiser':
default:
bicycle = new AcmeComfortCruiser();
}
Interface.ensureImplements(bicycle, Bicycle);
return bicycle;
};
/* GeneralProductsBicycleShop class. */
var GeneralProductsBicycleShop = function() {};
extend(GeneralProductsBicycleShop, BicycleShop);
GeneralProductsBicycleShop.prototype.createBicycle = function(model) {
var bicycle;
switch(model) {
case 'The Speedster':
bicycle = new GeneralProductsSpeedster();
break;
case 'The Lowrider':
bicycle = new GeneralProductsLowrider();
break;
case 'The Flatlander':
bicycle = new GeneralProductsFlatlander();
break;
case 'The Comfort Cruiser':
default:
bicycle = new GeneralProductsComfortCruiser();
}
Interface.ensureImplements(bicycle, Bicycle);
return bicycle;
};
/* Usage. */
var alecsCruisers = new AcmeBicycleShop();
var yourNewBike = alecsCruisers.sellBicycle('The Lowrider');
var bobsCruisers = new GeneralProductsBicycleShop();
var yourSecondNewBike = bobsCruisers.sellBicycle('The Lowrider');
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