交作业，感觉大家的超级麻烦
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>style样式</title>
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<h2 id="con">I love JavaScript</H2>
<p> JavaScript使网页显示动态效果并实现与用户交互功能。</p>
<script type="text/javascript">
var a =document.getElementById("con");
a.style.color="red";
a.style.backgroundColor="#CCC"
a.style.display="none";
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