.addClass()复制出去怎么不运行
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta charset="utf-8">
<title>:text表单选择器</title>
<script src="http://libs.baidu.com/jquery/1.9.0/jquery.js" type="text/javascript"></script>
<link href="style.css" rel="stylesheet" type="text/css" />
</head>
<body>
<h3>修改多个单行输入框元素的背景色</h3>
<form id="frmTest" action="#">
<input type="text" id="Text1" value="我是小纸条"/><br />
<textarea rows="3" cols="8"></textarea><br />
<input type="text" id="Text2" value="我也是小纸条"/><br />
<button>
Button</button><br />
</form>
<script type="text/javascript">
$("#frmTest:text").addClass("red
");
</script>
</body>
</html>
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