call和apply实现的继承

<!DOCTYPE html>

<html>

<title>call和apply实现的继承</title>

</head>

<body>

<p>

由构造函数和call()或者apply()方法实现的javascript继承

</p>

</body>

//Animal的构造函数

function Animal(name,age){

this.name = name;

this.age = age;

this.showInfo = function(){

alert("它的名字："+this.name+",它"+this.age+"岁了");

}

//call的用法

function Cat(name,age,sex){

Animal.call(this,name,age); //call(this,参数列表)

this.sex = sex;

this.showSex = function(){

alert("它是一只"+this.sex+"猫");

}

//apply的用法

function Dog(name,age,cry){

Animal.apply(this,arguments); //apply(this,arguments)

this.cry = cry;

this.showCry = function(){

alert("他的叫喊声："+this.cry);

}

var cat = new Cat("咪咪",2,"母");

cat.showInfo();

cat.showSex();

var dog = new Dog("震天吼",4,"汪汪。。。");

dog.showInfo();

dog.showCry();

</script>

</html>

巴特西