谈谈关于JavaScript中的MVC模式_基础知识

this.itemAdded = new Event(this);
this.itemRemoved = new Event(this);
this.selectedIndexChanged = new Event(this);
}

ListModel.prototype = {
getItems : function () {
return [].concat(this._items);
},

addItem : function (item) {
this._items.push(item);
this.itemAdded.notify({item : item});
},

removeItemAt : function (index) {
var item;

item = this._items[index];
this._items.splice(index, 1);
this.itemRemoved.notify({item : item});

if (index === this._selectedIndex) {
this.setSelectedIndex(-1);
}
},

getSelectedIndex : function () {
return this._selectedIndex;
},

setSelectedIndex : function (index) {
var previousIndex;

previousIndex = this._selectedIndex;
this._selectedIndex = index;
this.selectedIndexChanged.notify({previous : previousIndex});
}
};

Event.prototype = {
attach : function (listener) {
this._listeners.push(listener);
},

notify : function (args) {
var index;

for (index = 0; index < this._listeners.length; index += 1) {
this._listeners[index](this._sender, args);
}
}
};

this.listModified = new Event(this);
this.addButtonClicked = new Event(this);
this.delButtonClicked = new Event(this);

var _this = this;

// 绑定模型监听器
this._model.itemAdded.attach(function () {
_this.rebuildList();
});

this._model.itemRemoved.attach(function () {
_this.rebuildList();
});

// 将监听器绑定到 HTML 控件上
this._elements.list.change(function (e) {
_this.listModified.notify({ index : e.target.selectedIndex });
});

this._elements.addButton.click(function () {
_this.addButtonClicked.notify();
});

this._elements.delButton.click(function () {
_this.delButtonClicked.notify();
});
}

ListView.prototype = {
show : function () {
this.rebuildList();
},

rebuildList : function () {
var list, items, key;

list = this._elements.list;
list.html('');

items = this._model.getItems();
for (key in items) {
if (items.hasOwnProperty(key)) {
list.append($('' + items[key] + ''));
}
}

this._model.setSelectedIndex(-1);
}
};

/**
* 控制器。
*
* 控制器响应用户操作，调用模型上的变化函数。
*/
function ListController(model, view) {
this._model = model;
this._view = view;

var _this = this;

this._view.listModified.attach(function (sender, args) {
_this.updateSelected(args.index);
});

this._view.addButtonClicked.attach(function () {
_this.addItem();
});

this._view.delButtonClicked.attach(function () {
_this.delItem();
});
}

ListController.prototype = {
addItem : function () {
var item = window.prompt('Add item:', '');
if (item) {
this._model.addItem(item);
}
},

delItem : function () {
var index;

index = this._model.getSelectedIndex();
if (index !== -1) {
this._model.removeItemAt(this._model.getSelectedIndex());
}
},

updateSelected : function (index) {
this._model.setSelectedIndex(index);
}
};

view = new ListView(model, {
'list' : $('#list'),
'addButton' : $('#plusBtn'),
'delButton' : $('#minusBtn')
}),

controller = new ListController(model, view);
view.show();
});

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