交个作业！！！设置的2秒后自动隐藏
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>style样式</title>
</head>
<body>
<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 x=document.getElementById("con")
x.style.color="red"
x.style.backgroundColor="#CCC"
function display(){
x.style.display="none"
}
setInterval(display,2000)
</script>
</body>
</html>
