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javascript 面向对象,实现namespace,class,继承，重载

2009-10-29 00:00 996 查看

由于组里项目大多的javascript，css等客户端工作是另一同事在负责，该同事又特忙无法重构，老大也就只是提建议并未立即实施重构。但是我前些日子也改过些许客户端的小bug，确实那代码看得让人有些云里雾里，不知身在哪山，轻易不敢动代码，于是就自己动手鼓捣起我曾又爱又恨的javascript来，自己写一个简单的js实现namespace,继承，重载等面向对象的特性.欢迎拍砖灌水
.定义namespace
Namesapce.js

Namespace = new Object(); 
Namespace.register = function(fullname){ 
try 
{ 
var nsArray = fullname.split("."); 
var strNS = ""; 
var strEval = ""; 
for(var i=0;i<nsArray.length;i++){ 
if(strNS.length >0) 
strNS += "."; 
strNS += nsArray[i]; 
strEval += " if(typeof("+ strNS +") =='undefined') " + strNS + " = new Object(); "; 
} 
if(strEval != "") eval(strEval); 
}catch(e){alert(e.message);} 
}

.Employee.js
Employee.js

//注册命名空间 
Namespace.register("MyCompany"); 
//1.类:雇员 
MyCompany.Employee = function(empName){ 
this.Name = empName; 
this.Salary = 1000; 
this.Position = "cleaner"; 
} 
MyCompany.Employee.prototype.ShowName = function(){ 
return "I'm "+this.Name+",my salary is $" + this.Salary; 
} 
MyCompany.Employee.prototype.Work = function(){ 
return "I'm a "+ this.Position +",I'm cleaning all day!" 
} 
//2.类:程序员 
MyCompany.Developer = function(empName){ 
//继承父类属性 
MyCompany.Employee.call(this,empName); 
//覆盖父类属性 
this.Position = "developer"; 
//扩展属性 
this.Technology = "C#"; 
} 
//继承父类原型方法 
MyCompany.Developer.prototype = new MyCompany.Employee(); 
//覆盖父类方法 
MyCompany.Developer.prototype.Work = function(){ 
return "I'm a "+ this.Position +",i'm good at "+ this.Technology +",i'm coding all day!" 
}

测试代码

<html> 
<title>javascript 面向对象的实现 namespace,class,继承，重载</title> 
<head> 
<script language="javascript" src="namespace.js" type="text/javascript"></script> 
<script language="javascript" src="employee.js" type="text/javascript"></script> 
<script language="javascript" type="text/javascript"> 
    function showEmployee(){                 
        var emp = new MyCompany.Employee("xiaoming"); 
        showInfo(emp); 
    } 
    function showDeveloper(){ 
        var emp = new MyCompany.Developer("Gates"); 
        showInfo(emp); 
    }     
    function showInfo(emp){ 
        alert(emp.ShowName()); 
        alert(emp.Work()); 
    } 
</script> 
</head> 
<body> 
<input type="button" value="show employee info" onclick="showEmployee();"/><br/><br/> 
<input type="button" value="show developer info" onclick="showDeveloper();"/> 
</body> 
</html>

源代码打包下载

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