谈谈JavaScript MVC模式

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前端越来越重，原来那种意大利面似的代码显得越来越难以维护。

重构势在必行，初步方案我选定backbone.js 作为javascript mvc框架。如果说原因，我觉得一个方面是由于它的轻量级，另外，就是它不像ember.js 绑定ui视图，灵活性更大一些。

鉴于有同学没有接触过javascript mvc模式，我写了两个小例子：

第一个是：没有使用mvc模式的：

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>javascript demo no mvc</title></head> <body> <h3>JavaScript no MVC</h3><div><select name="" id="setAnimal"><option value="cat">cat</option><option value="fish">fish</option><option value="bird">bird</option></select><p id="whatDoesThisAnimalDo"></p></div><script type="text/javascript">         document.getElementById('setAnimal').onchange = function(){var thisAnimalDoes;switch(this.value){case 'cat': thisAnimalDoes = 'cat meows';break;case 'fish':thisAnimalDoes = 'fish swims';break;case 'bird':thisAnimalDoes = 'bird fies';break;default: thisAnimalDoes = 'wuff?';}document.getElementById('whatDoesThisAnimalDo').innerHTML = thisAnimalDoes;};    </script> </body> </html>

第二个例子：采用mvc模式

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>javascript demo mvc</title></head> <body> <h3>JavaScript simple MVC</h3><div><select name="" id="setAnimal"><option value="cat">cat</option><option value="fish">fish</option><option value="bird">bird</option></select><p id="whatDoesThisAnimalDo"></p></div><script type="text/javascript"> // controllerAnimal = {start: function(){this.view.start();},set: function(animalName){this.model.setAnimal(animalName);}};        // modelAnimal.model = {animalDictionary :{cat: 'meows',fish: 'swims',bird: 'flies'},currentAnimal:null,setAnimal: function(animalName){this.currentAnimal = this.animalDictionary[animalName]?animalName:null;this.onchange();},onchange: function(){Animal.view.update();},getAnimalAction: function(){return this.currentAnimal ? this.currentAnimal + " " + this.animalDictionary[this.currentAnimal] : 'wuff?';}};// viewAnimal.view = {start: function(){document.getElementById('setAnimal').onchange = this.onchange;},onchange: function(){Animal.set(document.getElementById('setAnimal').value);},update: function(){document.getElementById('whatDoesThisAnimalDo').innerHTML = Animal.model.getAnimalAction();}};Animal.start();    </script> </body> </html>

第二个例子中，进行了简单的mvc分层，看似代码量比第一种多了许多，但是对于后期模块的维护还是有很大的好处的。