谈谈JavaScript MVC模式
Posted 白马非马
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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(其实是 伪mvc 因为数据视图没有完全分开)
<!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">
// controller
Animal = {
start: function(){
this.view.start();
},
set: function(animalName){
this.model.setAnimal(animalName);
}
};
// model
Animal.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?‘;
}
};
// view
Animal.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>
第三种 还可以
Animal={
start:function(){
Animal.view.onchange(Animal.set);
Animal.view.start(Animal.onchange);
},
onchange:function(){
Animal.view.onchange(Animal.set);
},
set:function(animalName){
Animal.model.setAnimal(animalName);
Animal.view.update(Animal.model.getAnimalAction());
}
};
Animal.model={
animalDictionary:{
cat:‘meows‘,
fish:‘swims‘,
bird:‘flies‘
},
currentAnimal:null,
setAnimal:function(animalName){
this.currentAnimal=this.animalDictionary[animalName]?animalName:null;
},
getAnimalAction:function(){
return this.currentAnimal?this.currentAnimal+" "+this.animalDictionary[this.currentAnimal]:‘wuff?‘;
}
};
Animal.view={
start:function(callback){
document.getElementById(‘setAnimal‘).onchange=callback;
},
onchange:function(callback){
callback(document.getElementById(‘setAnimal‘).value);
},
update:function(data){
document.getElementById(‘whatDoesThisAnimalDo‘).innerHTML=data;
}
};
Animal.start();
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