<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>jQuery返回顶部</title>
<style>
*body{ background-attachment: fixed; background-image: url(about:blank); /* 必须的，防抖动 */}
*body #toTop{ position: absolute; top:expression(eval(document.documentElement.scrollTop+document.documentElement.clientHeight-this.offsetHeight-10)); /* 底部固定悬浮 */}
#toTop{ display: none; position: fixed; border: 1px solid red; right: 10px; bottom: 10px; padding: 10px 0; cursor: pointer;}
</style>
</head>
<body style="height:3000px;">
<div id="toTop"> scroll to top</div>
<script src="http://apps.bdimg.com/libs/jquery/1.9.1/jquery.js"></script>
<script>
$(function(){
var toTop = $(‘#toTop‘);
// 当窗口滚动条滚动时触发
$(window).scroll(function(){
var st = $(window).scrollTop(); //获取浏览器窗口向上滚动的距离
// 选项卡标签栏/控制台调试代码
// document.title = $(window).scrollTop();
// console.log($(window).scrollTop());
// 判断向上滚动距离是否大于500
if(st<500){
toTop.fadeOut(‘fast‘);
}else{
toTop.fadeIn(‘fast‘);
}
});
// 当点击按钮时触发
toTop.click(function(){
$(‘html ,body‘).animate({
scrollTop: 0
},300);
return false;
});
});
</script>
</body>
</html>
时间： 2024-10-29 19:10:36