function add(a,b) 
{ 
 alert(a+b); 
} 
function sub(a,b) 
{ 
 alert(a-b); 
} 
 
add.call(sub,3,1); 

function Animal(){ 
 this.name = "Animal"; 
 this.showName = function(){ 
  alert(this.name); 
 } 
} 
 
function Cat(){ 
 this.name = "Cat"; 
} 
 
var animal = new Animal(); 
var cat = new Cat(); 
 
//通过call或apply方法，将原本属于Animal对象的showName()方法交给对象cat来使用了。 
//输入结果为"Cat" 
animal.showName.call(cat,","); 
//animal.showName.apply(cat,[]); 

function Animal(name){  
 this.name = name;  
 this.showName = function(){  
  alert(this.name);  
 }  
}  
 
function Cat(name){ 
 Animal.call(this, name); 
}  
 
var cat = new Cat("Black Cat");  
cat.showName(); 

function Class10() 
{ 
 this.showSub = function(a,b) 
 { 
  alert(a-b); 
 } 
} 
 
function Class11() 
{ 
 this.showAdd = function(a,b) 
 { 
  alert(a+b); 
 } 
} 
 
function Class2() 
{ 
 Class10.call(this); 
 Class11.call(this); 
} 

fun.call(obj1, arg1, arg2, ...);
fun.apply(obj2, [arrs]);

var Obj1 = {
 name: 'Object1',
 say: function(p1, p2) {
  console.log(this.name + ' says ' + p1 + ' ' + p2);
 }
};

// logs 'Object1 says Good morning'
Obj1.say('Good', 'morning');

var Obj2 = {
 name: 'Object2'
};

// logs 'Object2 says Good afternoon'
Obj1.say.call(Obj2, 'Good', 'afternoon');

// logs 'Object2 says Good afternoon again'
Obj1.say.apply(Obj2, ['Good', 'afternoon again']);