javascript继承

javascript继承

function Parent(name){

this.name = name;

}

Parent.prototype.say = function(){

alert(this.name);

}

var parent = new Parent("wwwwww");

parent.say();

function Child(name,password){

Parent.call(this,name);

this.password = password;

}

Child.prototype = new Parent();

Child.prototype.sayword = function(){

alert(this.password);

}

var child = new Child("111111","222222222");

child.sayword();

////用call实现继承

function Parent(name){

this.name = name;

this.say = function(){

alert(this.name );

}

}

function Child(name,password){

Parent.call(this,name);

this.password = password;

}

var child = new Child("123123","sssss");

child.say();

*/

//用APPLY实现继承

/*

function Parent(name){

this.name= name;

this.say= function(){

alert(this.name);

}

}

function Child(name,password){

Parent.apply(this,new Array(name));

this.password = password;

this.sayworld = function(){

alert(this.password + this.name);

}

}

var parent = new Parent("zhangsan");

var child = new Child("lisi","123456");

parent.say();

child.say();

child.sayworld();