JavaScript 是一種解釋型的、基於對象的指令碼語言。儘管與 C++、C# 這樣成熟的物件導向的語言相比,JavaScript的功能要弱一些,但對於它的預期用途而言,JavaScript的功能已經足夠大了。但是由於各種各樣的原因,我們在實際進行開發的過程中往往忽略了他基於對象的這一特性,以至JavaScript編寫的程式顯的雜亂無章。這樣不僅不易於觀看,更不易於修改。今天就讓我們來看看JavaScript基於對象的這一特性。
類:function DelegateObject(){
var obj = new Object();
obj.value = "";
obj.FormatString = null;
obj.toString = function _toString(){
if(obj.FormatString != null)
return this.FormatString(this.Value);
else
return this.Value;
}
return obj;
}
var obj = new DelegateObject();
委託:
function DelegateObject(){
var obj = new Object();
obj.value = "";
obj.FormatString = null;
obj.toString = function _toString(){
if(obj.FormatString != null)
return this.FormatString(this.Value);
else
return this.Value;
}
return obj;
}
function ConvertToString(value){
return "Result:" + value;
}
var obj = new DelegateObject();
obj.Value = "Hello World!";
obj.FormatString = ConvertToString;
document.write(obj.toString());
重寫:
function DelegateObject(){
var obj = new Object();
obj.toString = function _toString(){
if(obj.FormatString != null)
return this.FormatString(this.Value);
else
return this.Value;
}
return obj;
}
繼承:
function DelegateObject(){
var obj = new Object();
obj.value = "";
obj.FormatString = null;
obj.toString = function _toString(){
if(obj.FormatString != null)
return this.FormatString(this.Value);
else
return this.Value;
}
return obj;
}
function Class2(){
var obj = new DelegateObject();
return obj;
}
function ConvertTOString(value){
return "Result:" + value;
}
var obj = new Class2();
obj.Value = "Hello World!";
obj.FormatString = ConvertTOString;
document.write(obj.toString());
事件:
function EventHandler(){
var eventobj = new Object();
eventobj._eventHandler = null;
eventobj.Activate = function _activate(){
if(eventobj._eventHandler != null)
eventobj._eventHandler();
}
eventobj.Add = function _add(eventHandler){
eventobj._eventHandler = EventHandler;
}
eventobj.Remove = function _remove(){
eventobj._eventHandler = null;
}
return eventobj;
}
function mouseClick(){
alert("Hello World!");
}
var obj = new EventHandler();
obj.Add(mouseClick());
obj.Activate();
枚舉:
function _StatusList(){
var object = new Object();
object.正常= "Normal";
object.刪除= "Delete";
object.審核通過= "Auditing";
object.駁回 = "OverRule";
return object;
}
Object.prototype.StatusList = new _StatusList();
function TObject(){
var obj = new Object();
obj.Type = "YiZhu";
obj.Status = Object.StatusList.審核通過;
}
alert(obj.Status);