javascript学习五

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<script type="text/javascript">//使用call实现继承function parent(username){this.username=username;this.sayHello=function(){alert(this.username);}}function child(username,password){parent.call(this,username);this.password=password;this.sayWord=function(){alert(this.password);}}var p=new parent("hello");var c=new child("word","123");p.sayHello();c.sayHello();c.sayWord();</script> apply方法方式：
<script type="text/javascript">//apply方法实现对象继承function parent(username){this.username=username;this.sayHello=function(){alert(this.username);}}function child(username,password){parent.apply(this,new Array(username));this.password=password;this.sayWord=function(){alert(this.password);}}var p=new parent("hello");var c=new child("word","123");p.sayHello();c.sayHello();c.sayWord();</script> 原型链方式：无法给构造函数传递参数
<script type="text/javascript">//使用原型链(prototype chain)实现对象的继承function parent(){}parent.prototype.hello="hello";parent.prototype.sayHello=function(){alert(this.hello);}function child(){}child.prototype=new parent();child.prototype.word="word";child.prototype.sayWord=function(){alert(this.word);}var p=new parent();var c=new child();p.sayHello();c.sayHello();c.sayWord();</script> 混合方式：（推荐使用）
<script type="text/javascript">//使用混合方式实现对象的继承function parent(hello){this.hello=hello;}parent.prototype.sayHello=function(){alert(this.hello);}function child(hello,word){//实现属性的继承parent.call(this,hello);this.word=word;}//实现方法的继承child.prototype=new parent();child.prototype.sayWord=function(){alert(this.word);}var p=new parent("hello");var c=new child("word","123");p.sayHello();c.sayHello();c.sayWord();</script> 学到这里，javascript的核心应该已经学完了，可是自己感觉没什么进步，不知道大家是怎么在学习啊，希望大家能指教指教小弟。