​x
 
<html>
<head>
​
<script type="text/javascript">
function moveleft()
{
document.getElementById('header').style.position="absolute"
document.getElementById('header').style.left="0"
}
​
function moveback()
{
document.getElementById('header').style.position="relative"
}
</script>
</head>
<body>
​
<h1 id="header" 
onmouseover="moveleft()"
onmouseout="moveback()">
请把鼠标移动到文本上</h1>
​
</body>
</html>
​