JavaScript物件導向之——繼承【原】

來源:互聯網
上載者:User

  本列子參照JavaScript核心技術一書略作修改,JS中繼承還遠不止於此,本博只略作講解

JS-Code

//<![CDATA
        //基類
        function tune(title,type,test)
        {
            this.title = title;
            this.type = type;
            this.getTitle = function(){
                return "Song: " + this.title +" Type:" + this.type;
            }
        }
        //衍生類別
        function artist_tune(title,type,artist,test)
        {
            this.artist = artist;
            this.toString("Artist is"+artist);
            tune.call(this,title,artist);//call繼承需列出參數
//            tune.apply(this,arguments);//apply直接使用參數列表,不包含最後一個參數,也就是說title,type,artist,test只取前三個參數
            this.toString = function(){
                return "Artist :"+this.artist+" "+this.getTitle();//調用繼承基類的方法
            }
        }
       
//        artist_tune.prototype = new tune();
        var song = new artist_tune("I want to hold your hand ","rock","Beatles","test");
        alert(song.toString());
         //]>

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