JavaScript 创建对象和构造类实现代码

创建一个对象
Java代码

<script type="text/javaScript"> 
var newObject=new Object(); 
//创建一个对象 
newObject.firstName="frank"; 
//增加一个firstName属性 
newObject.sayName=function(){ 
alert(this.firstName); 
} 
//添加一个sayName方法 
//调用sayName方法 
// newObject.sayName(); 
// newObject["sayName"](); 
var FirstName=newObject["firstName"]; 
var whatFunction; 
// if(whatVolume==1){ 
// whatFunction="sayName"; 
// }else if(whatVolume==2){ 
// whatFunction="sayLoudly" 
// } 
// newObject[whatFunction](); 
function sayLoudly(){ 
alert(this.firstName.toUpperCase()); 
} 
newObject.sayLoudly=sayLoudly; 
//另一种方式添加方法 
newObject["sayLoudly"](); 
</script>

利用json（javaScript Object Notation）创建对象和上面同样的效果。
Java代码

function sayLoudly(){ 
alert(this.firstName.toUpperCase()); 
} 
var newObject={ 
firstName:"frank", 
sayName:function(){alert(this.firstName);}, 
sayLoudly:sayLoudly 
}; 
//也可以这样 
var newObject={ 
firstName:"frank", 
sayName:function(){alert(this.firstName);}, 
sayLoudly:sayLoudly, 
lastName:{ 
lastName:"ziggy", 
sayName:function(){alert(this.lastName);} 
} 
}; 
newObject.lastName.sayName();

这样也ok
Java代码

function sayLoudly(){ 
alert(this.name.toUpperCase()); 
} 
function sayName(){ 
alert(this.name); 
} 
var newObject={ 
name:"frank", 
sayName:sayName, 
sayLoudly:sayLoudly, 
lastName:{ 
name:"ziggy", 
sayName:sayName 
} 
}; 
newObject.lastName.sayName();

JavaScript 中的类，还有构造方法。。。
Java代码

function newClass(){ 
alert("constructor"); 
this.firstName="frank"; 
this.sayName=function(){alert(this.firstName);} 
// return this; 
} 
//var nc=newClass(); 
var nc=new newClass(); 
//nc.firstName="ziggy"; is ok 
nc.sayName();

还可以这样来构造类
Java代码

function newClass(){ 
this.firstName="frank"; 
} 
newClass.prototype.sayName=function(){ 
alert(this.firstName); 
} 
var nc=new newClass(); 
nc.firstName="ziggy"; 
nc.sayName(); 
var nc2=new newClass(); 
nc2.sayName();

一般用prototypes来添加方法，这样不管有多少个实例，在内存中只有一个sayName方法。