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function EnhancedImage(src,onLoaded){
var self = this;
this.src = src;
this.width = 0;
this.height = 0;
this.onLoaded = onLoaded;
this.loaded = false;
this.image = null;

this.load = function(){
if(this.loaded)
return;
this.image = new Image();
this.image.src = this.src;
function loadImage(){
if(self.width != 0 && self.height != 0){
clearInterval(interval);
self.loaded = true;
self.onLoaded(self);//½«ÊµÀý´«Èë»Øµ÷º¯Êý
}
self.width = self.image.width;//ÊÇnumberÀàÐÍ
self.height = self.image.height;
}
var interval = setInterval(loadImage,100);
}
}
function onImageLoad(image){
document.getElementById('banner').appendChild(image.image);
}
var img = new EnhancedImage("somthing.jpg",onImageLoad);
img.load();

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{
 //³õʼ»¯Page
 if (page == null)
 {
  page = self;
 }
 if (page != self)
 {
  //Do sth. here...
 }
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Javascript Ô­Ðͺͼ̳Ð(Prototypes and Inheritance)

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