Whether it's pre-loading image rollovers or initialing an XmlHttpRequest object for a later Ajax request or assigning event handlers, it's your code that takes time.
是否预加载图像翻转或初始化xmlhttprequest对象以用于稍后的Ajax请求，或分配事件处理程序，您的代码将花时间处理这些问题。
Creates and returns an image object by loading the image data from the file at the specified path.
从指定的路径加载图片信息并返回创建的图片对象。
Creates and returns an image object by loading the image data from the file at the specified path.
从指定的路径加载图片信息并返回创建的图片对象。
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