jQuery gets the attribute information value
$().attr(attribute name); //Get the attribute information value
<!DOCTYPE html>
<html>
<head>
<title>php.cn</title>
<meta charset="utf-8" />
<script src="http://libs.baidu.com/jquery/1.10.2/jquery.min.js"></script>
<script>
function get(){
alert($("#in").attr('value'));
}
</script>
</head>
<body>
<input type="text" value="你好" id="in"/>
<input type="button" value="获取属性" onclick="get()">
</body>
</html>