function add(a,b)

{

   return  a + b;

}

alert(add(1,2));    // 结果 3

var add = function(a,b)

{

   return  a + b;

}

alert(add(1,2));    // 结果 3

var add = function theAdd(a,b)

{

   return a + b;

}

alert(add(1,2));      // 结果 3 
alert(theAdd(1,2));    // 结果也是 3

var myObject = new Object();

myObject.add = function(a,b){return a+b};

// myObject 现在有一个叫做“add”的属性（或方法）”

// 而且我能够象下面这样使用它

myObject.add(1, 2);

function ball()   // 也许看起来有点奇怪，但是这个声明

{             // 创建了一个叫做Ball的对象

   i = 1;

}

alert(typeof ball);   // 结果 "function"

alert(ball);  

//结果为：

//function ball()

//{

//   i = 1;

//}

function Ball()   // 也许看起来有点奇怪，但是这个声明创建了一个叫做Ball的对象，而且你能够引用它或者象下面那样给它增加属性 
{          

} 

ball.callsign="The ball"; // 给Ball增加属性 
alert(ball.callsign); // 输出 "The ball"

function myFunction(message) 
{ 
alert(message); 
} 
var ptr=myFunction; // ptr指向了myFunction 
ptr("hello");     // 这句会执行myFunction：输出"hello"

function sayName(name) 
{ 
alert(name); 
}

var object1=new Object();   // 创建三个对象 
var object2=new Object(); 
var object3=new Object();

object1.sayMyName=sayName;    // 将这个函数指派给所有对象 
object2.sayMyName=sayName; 
object3.sayMyName=sayName;

object1.sayMyName("object1");  // 输出 "object1" 
object2.sayMyName("object2");  // 输出 "object2" 
object3.sayMyName("object3");  // 输出 "object3"

function myFunction() 
{ 
alert(myFunction.message); 
} 
myFunction.message="old"; 
var ptr1=myFunction;         // ptr1 指向 myFunction 
var ptr2=myFunction;         // ptr2 也指向 myFunction 
ptr1();           // 输出 "old" 
ptr2();               // 输出 "old" 
myFunction.message="new"; 
ptr1();           // 输出 "new" 
ptr2(); 

function myFunction() 
{ 
alert("Old"); 
} 
myFunction(); // 输出 "Old" 
myFunction=function() 
{ 
alert("New"); 
}; 
myFunction(); // 输出 "New" 

function myFunction() 
{ 
alert("Old"); 
} 
var savedFuncion=myFunction; 
myFunction=function() 
{ 
alert("New"); 
}; 
myFunction();  // 输出 "New" 
savedFuncion(); // 输出 "Old"

function get(a,b,c)

{

   function cal(n)

   {

      return n/2;

   }

   var result = “”;

   result+=cal(a)+” ”; 

   result+=cal(b)+” ”; 

   result+=cal(c); 

}

var resultString = get(10,20,30);

alert(resultString);   // 输出 "5 10 15"

function calculate(number) 
{ 
    return number/3; 
} 
function getHalfOf(num1, num2, num3)   
{ 
    function calculate(number) 
    { 
       return number/2; 
    } 
    var result=""; 
    result+=calculate(num1)+" "; 
    result+=calculate(num2)+" "; 
    result+=calculate(num3); 
}     
var resultString=getHalfOf(10,20,30); 
alert(resultString);     // 输出 "5 10 15"

function Ball() 
{ 
} 
var ball0=new Ball(); // ball0 现在指向一个新对象 
alert(ball0);     // 输出 "Object"，因为 ball0 现在是一个对象

function Ball(message) 
{ 
alert(message); 
} 
var ball0=new Ball("creating new Ball"); // 创建对象并输出消息 
ball0.name="ball-0";           // ball0现在有一个属性：name 
alert(ball0.name);            // 输出 "ball-0"

function Ball(message) 
{ 
alert(message); 
} 
var ball0=new Object(); 
ball0.construct=Ball; 
ball0.construct("creating new ball"); // 执行 ball0.Ball 
("creating.."); 
ball0.name="ball-0";           
alert(ball0.name); 

function Ball() 
{ 
} 
var ball0=new Ball(); // ball0 现在指向了类型Ball的一个新实例 
ball0.name="ball-0"; // ball0 现在有一个属性"name" 
var ball1=new Ball(); 
ball1.name="ball-1"; 
var ball2=new Ball(); 
alert(ball0.name);  // 输出 "ball-0" 
alert(ball1.name);  // 输出 "ball-1" 
alert(ball2.name);  // 哦，我忘记给ball2添加“name”了！

function Ball(message, specifiedName) 
{ 
alert(message); 
this.name=specifiedName;        
} 
var ball0=new Ball("creating new Ball", "Soccer Ball"); 
alert(ball0.name);          // prints "Soccer Ball"

function Ball(color, specifiedName, owner, weight) 
{ 
this.name=specifiedName;        
this.color=color; 
this.owner=owner; 
this.weight=weigth; 
} 
var ball0=new Ball("black/white", "Soccer Ball", "John", 20); 
var ball1=new Ball("gray", "Bowling Ball", "John", 30); 
var ball2=new Ball("yellow", "Golf Ball", "John", 55); 
var balloon=new Ball("red", "Balloon", "Pete", 10); 
alert(ball0.name);            // 输出 "Soccer Ball" 
alert(balloon.name);           // 输出 "Balloon" 
alert(ball2.weight);           // 输出 "55"

function Employee(name, salary, mySupervisor) 
{ 
this.name=name;        
this.salary=salary; 
this.supervisor=mySupervisor; 
} 
var boss=new Employee("John", 200); 
var manager=new Employee("Joan", 50, boss); 
var teamLeader=new Employee("Rose", 50, boss); 
alert(manager.supervisor.name+" is the supervisor of "+manager.name); 
alert(manager.name+"\'s supervisor is "+manager.supervisor.name);

function Employee(name, salary) 
{ 
this.name=name;        
this.salary=salary; 
this.addSalary=addSalaryFunction; 
this.getSalary=function() 
         { 
          return this.salary; 
         }; 
} 
function addSalaryFunction(addition) 
{ 
this.salary=this.salary+addition; 
} 
var boss=new Employee("John", 200000); 
boss.addSalary(10000);          // boss 长了 10K 工资……为什么老板工资可以长这么多:'( 
alert(boss.getSalary());         // 输出 210K……为什么默认工资也那么高……:'(

addSalary和getSalary演示了几种将函数赋给属性的不同方法。

如前面数次提到的，一个函数声明的结果是一个对象 被创建。

function Employee(name, salary) 
{ 
this.name=name;        
this.salary=salary; 
this.addSalary=addSalaryFunction; 
this.getSalary=function() 
         { 
          return this.salary; 
         }; 
} 
function addSalaryFunction(addition) 
{ 
this.salary=this.salary+addition; 
} 
var boss=new Employee("John", 200000); 
var boss2=new Employee("Joan", 200000); 
var boss3=new Employee("Kim", 200000);

function Employee(name, salary) 
{ 
this.name=name;        
this.salary=salary; 
this.addSalary=addSalaryFunction; 
this.getSalary=function() 
         { 
          return this.salary; 
         }; 
} 
function addSalaryFunction(addition) 
{ 
this.salary=this.salary+addition; 
} 
var boss1=new Employee("John", 200000); 
var boss2=new Employee("Joan", 200000);

// 给getSalary函数对象添加属性 
boss1.getSalary.owner="boss1"; 
boss2.getSalary.owner="boss2"; 
alert(boss1.getSalary.owner);  // 输出 "boss1" 
alert(boss2.getSalary.owner);  // 输出 "boss2" 
// 如果两个对象指向同一个函数对象，那么 上面两个输出都应该是“boss2”。 
// 给addSalary函数对象添加属性 
boss1.addSalary.owner="boss1"; 
boss1.addSalary.owner="boss2"; 
alert(boss1.addSalary.owner);  // 输出 "boss2" 
alert(boss2.addSalary.owner);  // 输出 "boss2"

// 因为两个对象都指向同一个函数

// 当修改其中一个的时候，会影响所有的实例（所以两个都输出“boss2”）.

function Employee(name, salary) 
{ 
this.name=name;        
this.salary=salary; 
this.addSalary=addSalaryFunction; 
this.getSalary=getSalaryFunction; 
} 
function getSalaryFunction() 
{ 
return this.salary; 
} 
function addSalaryFunction(addition) 
{ 
this.salary=this.salary+addition; 
}

function Test() 
{ 
} 
alert(Test.prototype); // 输出 "Object"

function Fish(name, color) 
{ 
this.name=name; 
this.color=color; 
} 
Fish.prototype.livesIn="water"; 
Fish.prototype.price=20; 

var fish1=new Fish("mackarel", "gray"); 
var fish2=new Fish("goldfish", "orange"); 
var fish3=new Fish("salmon", "white");

for (int i=1; i<=3; i++) 
{ 
var fish=eval("fish"+i);  // 我只是取得指向这条鱼的指针 
alert(fish.name+","+fish.color+","+fish.livesIn+","+fish.price); 
} 

"mackarel, gray, water, 20" 
"goldfish, orange, water, 20" 
"salmon, white water, 20"

function Employee(name, salary) 
{ 
this.name=name;        
this.salary=salary; 
} 
Employee.prototype.getSalary=function getSalaryFunction() 
{ 
return this.salary; 
} 
Employee.prototype.addSalary=function addSalaryFunction(addition) 
{ 
this.salary=this.salary+addition; 
}

var boss1=new Employee("Joan", 200000); 
var boss2=new Employee("Kim", 100000); 
var boss3=new Employee("Sam", 150000); 

alert(boss1.getSalary());  // 输出 200000 
alert(boss2.getSalary());  // 输出 100000 
alert(boss3.getSalary());  // 输出 150000