<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>手机移动端返回顶部js代码</title>
<script src="http://libs.baidu.com/jquery/1.11.3/jquery.min.js"></script>
</head>
<body style="background-color: #dddfff;">
<div class="headeline"></div>
<p style="font-size:24px;color:red;text-align: center;">手机往下滑动即可显示返回顶部按钮!</p>
<!--演示内容开始-->
<div style="height:2000px;"></div>
<!--演示内容结束-->
</body>
<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:'<span>返回顶部</span>', //返回顶部按钮
controlattrs:{offsetx:30,offsety:80},//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>
</html>
向下滑动时出现返回顶部按钮并点击返回顶部的完整案例
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