<html>
<head>
<title>js</title>
<script type="text/javascript">
$(document).ready(function () {
$(window).scroll(function () {
var a = document.getElementById("eq").offsetTop;
if (a >= $(window).scrollTop() && a < ($(window).scrollTop()+$(window).height())) {
alert("div在可视范围");
}
});
});
</script>
</head>
<body>
<div style="width:1px;height:2000px;"></div>
<div id="eq" style=" width:100px; height:100px; background-color:Red;">1</div>
<div style="width:1px;height:2000px;"></div>
</body>
</html>
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