代码示例：（标识：dhtm_form_color_textarea）
<html>
<head>
<script type="text/javascript">
function newColor(color)
{
document.getElementById('x').style.background=color
}
</script>
</head>
<body>
<p>本例演示如何改变 textarea 的背景颜色。</p>
<p>请把鼠标移动到下面的三个表格单元上，背景颜色将会改变：</p>
<table width="100%"><tr>
<td bgcolor="red" onmouseover="newColor('red')"> </td>
<td bgcolor="blue" onmouseover="newColor('blue')"> </td>
<td bgcolor="green" onmouseover="newColor('green')"> </td>
</tr></table>
<form>
<textarea id="x" rows="5" cols="20">
This example can not be edited
because our editor uses a textarea
for input,
and your browser does not allow
a textarea inside a textarea.
