这是我的代码:
<html>
<head>
<title>Demo</title>
<script>
function show()
{
var content = document.getElementById("content");
var sub = content.getElementById("sub1");
alert(sub.nodeName);
}
</script>
</head>
<body>
<div id="content">
<div id="sub1">
Content 1
</div>
<div id="sub2">
Content 2
</div>
<input type="button" value="Click" onclick="show()" />
</div>
</body>
</html>
为什么content.getElementById和alert函数不起作用？谢谢你的回答.
你有一类sub1,没有IDsub1
更改
<div class="sub1">
至
<div id="sub1">
也改变:
var sub = content.getElementById("sub1");
至:
var sub = document.getElementById("sub1");