//当滚动条的位置处于距顶部100像素以下时，跳转链接出现，否则消失
$(function () {
$(window).scroll(function () {
if ($(window).scrollTop() > 100) {
$("#back-to-top").fadeIn(1000);
console.log($(window).scrollTop())
console.log(window.innerHeight)
}
else {
$("#back-to-top").fadeOut(1000);
}
});
//当点击跳转链接后，回到页面顶部位置
$("#back-to-top").click(function () {
$('body,html').animate({scrollTop: 0}, 1000);
return false;
});
});
我写了小demo 明明就可以触发
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<meta name="viewport" content="width=device-width,user-scalable=no,initial-scale=1.0"/>
<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1"/>
<meta name="keywords" content=""/>
<meta name="description" content=""/>
<meta name="robots" content="all">
<meta name="renderer" content="webkit">
<style>
*{
margin: 0;padding: 0;
}
div{
width: 100%;
height:1880px;
background: #BDBDBD;
}
.fix{
width: 50px;
height:50px;
background: #B72712;
position: fixed;
right: 0;
bottom: 50px;
color: #ffffff;
font-size: 18px;
text-align: center;
display: none;
}
</style>
</head>
<body>
<div id="div">
我是主体内容
</div>
<div class="fix" id="back-to-top">
返回顶部
</div>
</body>
<script src="jquery.js"></script>
<script>
$(function () {
$(window).scroll(function () {
if ($(window).scrollTop() > 100) {
$("#back-to-top").fadeIn(1000);
console.log($(window).scrollTop())
console.log(window.innerHeight)
}
else {
$("#back-to-top").fadeOut(1000);
}
});
//当点击跳转链接后，回到页面顶部位置
$("#back-to-top").click(function () {
$('body,html').animate({scrollTop: 0}, 1000);
return false;
});
});
</script>
</html>
与恶龙缠斗过久,自身亦成为恶龙；凝视深渊过久,深渊将回以凝视…
