<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>