<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "
http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="
http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
</head>
<body>
<div class="top">
<p>this is top p</p>
</div>
<div class="mid">
<p id="midp">this is mid p</p>
</div>
<div class="bottom">
<input type="button" class="buttomp" value="this is bottom p" />
</div>
</body>
</html>
1.请写出将this is top p 修改成 this is top b的js脚本
2.请写出将this is mid p 修改成 this is mid b的js脚本
3.请写出将this is bottom p 修改成 this is bottom b的js脚本
4.如何为this is top p加上鼠标手势显示