您可以使用.is（'：visible'）选择所有可见的元素。
<html>
<head>
<title>divvisible</title>
<script src="../../Scripts/jquery-1.4.1.min.js" type="text/javascript"></script>
<script type="text/javascript">
$(document).ready(function () {
$("button").click(function () {
var dim = $('#div1').is(":visible");
if (dim == false) {
$('#div1').css({ "display": "block", "color": "red" });
}
});
});
</script>
</head>
<body>
<div id="div1" style="display:none">
<p>Div is visible</p>
</div>
<button type="button" id="btn" onclick="click()">Click Here</button><br />
</body>
</html>