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Javascript ÃæÏò¶ÔÏó»úÖÆµÄʵÏÖ
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function Player(url){
this.url = url;
this.showUrl = function(){
alert(this.url);
}
this.play = function(){
// do play
}
}
var myPlayer = new Player("test.mp3");
myPlayer.showUrl();
alert(myPlayer instanceof Player);
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function Player(url){
this.url = url;
if(typeof Player._initialized == "undefined"){
Player.prototype.showUrl = function(){
alert(this.url);
Player._initialized = true;
}
}
}
var myPlayer = new Player("test.mp3");
myPlayer.showUrl();
alert(myPlayer instanceof Player);
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JavaScript ±¾Éí²¢Ã»·¨Çø·Ö˽ÓбäÁ¿ºÍ¹«¹²±äÁ¿£¬Í¨³£ÔÚÃüÃûÉÏÇø·Öһϣ¬Ò»°ãϰ¹ßÔÚ˽ÓбäÁ¿µÄǰ¼ÓÒ»¸öÏ»®Ïß this._privateProperty¡£
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function Player(url){
this.url = url;
var self = this;
var position;
this.onPositionChange = null; // ʼþ¶¨Òå
this.setPosition = function(value){
self.position = value;
if (this.onPositionChange)
this.onPositionChange(this); //ʼþ´¥·¢
}
}
var myPlayer = new Player("test.mp3");
myPlayer.onPositionChange = function fun(obj){ //ʼþ¶©ÔÄ
alert(obj.position + 's Position Change');
}
myPlayer.setPosition(100);
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