html+css3+jQuery带底部返回顶部按钮代码

1、新建html文档。

2、书写hmtl代码。<div id="moquu_wxin" class="moquu_wxin"><a href="javascript:void(0)"><div class="moquu_wxinh"></div></a></div><div id="moquu_wshare" class="moquu_wshare"><a href="javascript:void(0)"><div class="moquu_wshareh"></div></a></div><div style="height:1000px;"></div>

3、书写css代码。html, body { height: 100% }html, body, form荑樊综鲶, input, span, p, img, ul, ol, li, dl, dt, dd { margin: 0; padding: 0; border: 0 }ul, ol { list-style: none }body { background: #fff; font: 12px/1.5 arial, sans-serif; text-align: center; height: 3000px; }a { text-decoration: none }a:hover { text-decoration: underline }#moquu_top, #moquu_wxin, #moquu_wshare { z-index: 2; width: 30px; height: 30px; right: 10px; position: fixed; cursor: pointer; _position: absolute; _bottom: auto; _top:expression(eval(document.documentElement.scrollTop+document.documentElement.clientHeight-this.offsetHeight-(parseInt(this.currentStyle.marginTop, 10)||0)-(parseInt(this.currentStyle.marginBottom, 10)||0)))}#moquu_wxin { bottom: 130px; right: 10px; }#moquu_wxin a { background: url(../images/sbtn.png) 0 0px; right: 0; float: left; width: 30px; height: 30px; text-indent: -9999px }#moquu_wxin a:hover { background: url(../images/sbtn.png) -30px -0px }#moquu_wshare { bottom: 100px; right: 10px; }#moquu_wshare a { background: url(../images/sbtn.png) 0 -30px; width: 30px; height: 30px; right: 0; float: left; text-indent: -9999px }#moquu_wshare a:hover { background: url(../images/sbtn.png) -30px -30px }.moquu_wxin, .moquu_wshare { position: relative; z-index: 2 }.moquu_wxin a:hover .moquu_wxinh, .moquu_wshare a:hover .moquu_wshareh { display: block }.moquu_wxin .moquu_wxinh { position: absolute; display: none; right: 30px; bottom: 0px; width: 70px; height: 30px; background: url(../images/fankui.png) 0 0 no-repeat #ff6060; color: #FFF; border-radius: 4px 0 0 4px; }.moquu_wshare .moquu_wshareh { position: absolute; display: none; right: 36px; bottom: -85px; width: 100px; height: 120px; background: url(../images/weixin.png) no-repeat }#topcontrol { background: #4c4c4c; height: 30px; width: 30px; border-radius: 4px; }

4、书写js代码。敛财醣沁并引用<script src="js/jquery.js" ></script><script>var scrolltotop={ setting:{ startline:100, //起始行 scrollto:0, //滚动到指定位置 scrollduration:400, //滚动过渡时间 fadeduration:[500,100] //淡出淡现消失 }, controlHTML:'<img src="images/top.png" style="width:30px; height:30px; border:0;" />', //返回顶部按钮 controlattrs:{offsetx:10,offsety:10},//返回按钮固定位置 anchorkeyword:"#top", state:{ isvisible:false, shouldvisible:false },scrollup:function(){ if(!this.cssfixedsupport){ this.$control.css({opacity:0}); } var dest=isNaN(this.setting.scrollto)?this.setting.scrollto:parseInt(this.setting.scrollto); if(typeof dest=="string"&&jQuery("#"+dest).length==1){ dest=jQuery("#"+dest).offset().top; }else{ dest=0; } this.$body.animate({scrollTop:dest},this.setting.scrollduration); },keepfixed:function(){ var $window=jQuery(window); var controlx=$window.scrollLeft()+$window.width()-this.$control.width()-this.controlattrs.offsetx; var controly=$window.scrollTop()+$window.height()-this.$control.height()-this.controlattrs.offsety; this.$control.css({left:controlx+"px",top:controly+"px"}); },togglecontrol:function(){ var scrolltop=jQuery(window).scrollTop(); if(!this.cssfixedsupport){ this.keepfixed(); } this.state.shouldvisible=(scrolltop>=this.setting.startline)?true:false; if(this.state.shouldvisible&&!this.state.isvisible){ this.$control.stop().animate({opacity:1},this.setting.fadeduration[0]); this.state.isvisible=true; }else{ if(this.state.shouldvisible==false&&this.state.isvisible){ this.$control.stop().animate({opacity:0},this.setting.fadeduration[1]); this.state.isvisible=false; } } },init:function(){ jQuery(document).ready(function($){ var mainobj=scrolltotop; var iebrws=document.all; mainobj.cssfixedsupport=!iebrws||iebrws&&document.compatMode=="CSS1Compat"&&window.XMLHttpRequest; mainobj.$body=(window.opera)?(document.compatMode=="CSS1Compat"?$("html"):$("body")):$("html,body"); mainobj.$control=$('<div id="topcontrol" >'+mainobj.controlHTML+"</div>").css({position:mainobj.cssfixedsupport?"fixed":"absolute",bottom:mainobj.controlattrs.offsety,right:mainobj.controlattrs.offsetx,opacity:0,cursor:"pointer"}).attr({title:"返回顶部"}).click(function(){mainobj.scrollup();return false;}).appendTo("body");if(document.all&&!window.XMLHttpRequest&&mainobj.$control.text()!=""){mainobj.$control.css({width:mainobj.$control.width()});}mainobj.togglecontrol(); $('a[href="'+mainobj.anchorkeyword+'"]').click(function(){mainobj.scrollup();return false;}); $(window).bind("scroll resize",function(e){mainobj.togglecontrol();}); }); }};scrolltotop.init();</script>

5、整体代码结构。

6、查看效果。