<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<script src="./js/jquery.min.js"></script>
<style>
.recommend {
height: 1000px;
background-color: red;
}
.fixedtool {
width: 100px;
height: 101px;
background-color: pink;
}
</style>
</head>
<body>
<div class="recommend">1</div>
<div class="fixedtool">2</div>
<script>
$(function() {
var toolTop = $(".recommend").offset().top;
$(window).scroll(function() {
if ($(document).scrollTop() >= toolTop) {
$(".fixedtool").fadeIn();
} else {
$(".fixedtool").fadeOut();
}
})
})
</script>
</body>
</html>
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