只需将所有内容包装在div中，然后将其向下滑动即可.

Just wrap all your content inside a div and slide that down.

CSS

#bodyContent {
   display:none;
   height: 100%;
}

HTML

<div id="bodyContent">
    //all your stuff goes in here
</div>

Javascript/JQuery

$(document).ready(function(){
   $('#bodyContent').slideDown();
});