Modern Web sites are highly interactive: Dynamic navigation menus, image rollovers, forms, and even drag and drop are available.

现代的网站是高度交互的：动态的导航菜单、图像切换、表单，甚至还支持拖拉操作。

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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。

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