​x
 
<html>
<head>
<script type="text/javascript">
function getValue()
{
var x=document.getElementById("myHeader")
alert(x.innerHTML)
}
</script>
</head>
<body>
​
<h1 id="myHeader" onclick="getValue()">这是标题</h1>
<p>点击标题，会提示出它的值。</p>
​
</body>
</html>
​