［代码转载］仿新浪网“返回顶部”效果 - csngmap资源站－安卓资源大本营

［代码转载］仿新浪网“返回顶部”效果

2014-02-06 00:03:53 -0500

拖动滚动条离开顶部就会自动显示“返回顶部”按钮，回到顶部按钮会自动消失。转自懒人图库

使用方法：建议添加在页面底部。因代码需加载几十k的JQuery插件，且兼容性也不是很好，故也不建议各位使用

html代码

<style type="text/css">
.backToTop {
display: none;
width: 20px;
line-height: 1.3;
padding: 5px 1px;
background-color: black;
color: #fff;
font-size: 18px;
text-align: center;
position: fixed;
_position: absolute;
right: 10px;
bottom: 100px;
_bottom: "auto";
cursor: pointer;
opacity: .7;
filter: Alpha(opacity=70);
}
</style>
<script type="text/javascript" src="http://b.wodemo.net/distribution/265107/5f2dedd3fa0e62b37d987d055ff16d1f/jquery-1.3.2.min.js"></script>

<script type="text/javascript">
	(function() {
	 var $backToTopTxt = "返回顶部", $backToTopEle = $('<div class="backToTop"></div>').appendTo($("body"))
	 .text($backToTopTxt).attr("title", $backToTopTxt).click(function() {
	 $("html, body").animate({ scrollTop: 0 }, 120);
	 }), $backToTopFun = function() {
	 var st = $(document).scrollTop(), winh = $(window).height();
	 (st > 0)? $backToTopEle.show(): $backToTopEle.hide();
	 //IE6下的定位
	 if (!window.XMLHttpRequest) {
	 $backToTopEle.css("top", st + winh - 166);
	 }
	 };
	 $(window).bind("scroll", $backToTopFun);
	 $(function() { $backToTopFun(); });
	})();
	</script>

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