<body>
<div id="warp" onmouseover="over()" onmouseout="out()">
<div id="text" style="display: none;">这里面有一段文字</div>
</div>
</body>
<script type="text/javascript">
function over(){
var div = document.getElementById('warp');//获取大div对象
var text = document.getElementById('text');//获取文字div对象
text.style.display="block";
}//鼠标进入显示文字
function out(){
var div = document.getElementById('warp');
var text = document.getElementById('text');
text.style.display="none";
}//鼠标退出不显示文字