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滑动方式返回顶部的js脚本

今天发现了一个Jquery的 滑动方式返回顶部的js脚本

可以自己修改成个性化的。

官方的网址是 英文资料请阅读:http://www.dynamicdrive.com/dynamicindex3/scrolltop.htm

2012-10-20日 最新的js下载地址是 http://www.dynamicdrive.com/dynamicindex3/scrolltopcontrol.js

源码：

//** jQuery Scroll to Top Control script- (c) Dynamic Drive DHTML code library: http://www.dynamicdrive.com.
//** Available/ usage terms at http://www.dynamicdrive.com (March 30th, 09')
//** v1.1 (April 7th, 09'):
//** 1) Adds ability to scroll to an absolute position (from top of page) or specific element on the page instead.
//** 2) Fixes scroll animation not working in Opera. 


var scrolltotop={
    //startline: Integer. Number of pixels from top of doc scrollbar is scrolled before showing control
    //scrollto: Keyword (Integer, or "Scroll_to_Element_ID"). How far to scroll document up when control is clicked on (0=top).
    setting: {startline:100, scrollto: 0, scrollduration:1000, fadeduration:[500, 100]},
    controlHTML: '<img src="up.png" style="width:48px; height:48px" />', //HTML for control, which is auto wrapped in DIV w/ ID="topcontrol"
    controlattrs: {offsetx:5, offsety:5}, //offset of control relative to right/ bottom of window corner
    anchorkeyword: '#top', //Enter href value of HTML anchors on the page that should also act as "Scroll Up" links

    state: {isvisible:false, shouldvisible:false},

    scrollup:function(){
        if (!this.cssfixedsupport) //if control is positioned using JavaScript
            this.$control.css({opacity:0}) //hide control immediately after clicking it
        var dest=isNaN(this.setting.scrollto)? this.setting.scrollto : parseInt(this.setting.scrollto)
        if (typeof dest=="string" && jQuery('#'+dest).length==1) //check element set by string exists
            dest=jQuery('#'+dest).offset().top
        else
            dest=0
        this.$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($){
            var mainobj=scrolltotop
            var iebrws=document.all
            mainobj.cssfixedsupport=!iebrws || iebrws && document.compatMode=="CSS1Compat" && window.XMLHttpRequest //not IE or IE7+ browsers in standards mode
            mainobj.$body=(window.opera)? (document.compatMode=="CSS1Compat"? $('html') : $('body')) : $('html,body')
            //包含#topcontrol这个div
            mainobj.$control=$('<div id="topcontrol">'+mainobj.controlHTML+'</div>')
                .css({position:mainobj.cssfixedsupport? 'fixed' : 'absolute', bottom:mainobj.controlattrs.offsety, right:mainobj.controlattrs.offsetx, opacity:0, cursor:'pointer'})
                .attr({title:'Scroll Back to Top'})
                .click(function(){mainobj.scrollup(); return false})
                .appendTo('body')
            if (document.all && !window.XMLHttpRequest && mainobj.$control.text()!='') //loose check for IE6 and below, plus whether control contains any text
                mainobj.$control.css({width:mainobj.$control.width()}) //IE6- seems to require an explicit width on a DIV containing text
            mainobj.togglecontrol()
            //点击控制
            $('a[href="' + mainobj.anchorkeyword +'"]').click(function(){
                mainobj.scrollup()
                return false
            })
            $(window).bind('scroll resize', function(e){
                mainobj.togglecontrol()
            })
        })
    }
}

scrolltotop.init()

有网友把 这个js脚本用中文备注了 。 分享给大家看 我的老博客把编码给转了撮合着看看意思吧

var scrolltotop={
//startline: 鼠标向下滚动了100px后出现#topcontrol
//scrollto: 它的值可以是整数，也可以是一个id标记。若为整数（假设为n），则滑动到距离top的n像素处；若为id标记，则滑动到该id标记所在的同等高处
//scrollduration:滑动的速度
//fadeduration:#topcontrol这个div的淡入淡出速度，第一个参数为淡入速度，第二个参数为淡出速度
//controlHTML:控制向上滑动的html源码，默认为<img style="width: 48px; height: 48px;" src="up.png" alt="" />，可以自行更改。该处的html代码会被包含在一个id标记为#topcontrol的div中。
//controlattrs:控制#topcontrol这个div距离右下角的像素距离
//anchorkeyword:滑动到的id标签
/*state: isvisible:是否#topcontrol这个div为可见
shouldvisible:是否#topcontrol这个div该出现
*/

setting: {startline:100, scrollto: 0, scrollduration:500, fadeduration:[500, 100]},
controlHTML: '<a href="#top">back-to-top</a>',
controlattrs: {offsetx:5, offsety:5},
anchorkeyword: '#top',

state: {isvisible:false, shouldvisible:false},

scrollup:function(){
    if (!this.cssfixedsupport) {
        this.$control.css({opacity:0})
};//点击后隐藏#topcontrol这个div
var dest=isNaN(this.setting.scrollto)? this.setting.scrollto : parseInt(this.setting.scrollto);
if (typeof dest=="string" && jQuery('#'+dest).length==1) { //检查若scrollto的值是一个id标记的话
    dest=jQuery('#'+dest).offset().top;
} else { //检查若scrollto的值是一个整数
    dest=this.setting.scrollto;
};
this.$body.animate({scrollTop: dest}, this.setting.scrollduration);
},

keepfixed:function(){
//获得浏览器的窗口对象
var $window=jQuery(window);
//获得#topcontrol这个div的x轴坐标
var controlx=$window.scrollLeft() + $window.width() – this.$control.width() – this.controlattrs.offsetx;
//获得#topcontrol这个div的y轴坐标
var controly=$window.scrollTop() + $window.height() – this.$control.height() – this.controlattrs.offsety;
//随着滑动块的滑动#topcontrol这个div跟随着滑动
this.$control.css({left:controlx+'px', top:controly+'px'});
},

togglecontrol:function(){
//当前窗口的滑动块的高度
var scrolltop=jQuery(window).scrollTop();
if (!this.cssfixedsupport) {
    this.keepfixed();
};
//若设置了startline这个参数，则shouldvisible为true
this.state.shouldvisible=(scrolltop>=this.setting.startline)? true : false;
//若shouldvisible为true，且!isvisible为true
if (this.state.shouldvisible && !this.state.isvisible){
    this.$control.stop().animate({opacity:1}, this.setting.fadeduration[0]);
    this.state.isvisible=true;
} //若shouldvisible为false，且isvisible为false
else if (this.state.shouldvisible==false && this.state.isvisible){
    this.$control.stop().animate({opacity:0}, this.setting.fadeduration[1]);
    this.state.isvisible=false;
}
},

init:function(){
    jQuery(document).ready(function($){
        var mainobj=scrolltotop;
        var iebrws=document.all;
mainobj.cssfixedsupport=!iebrws || iebrws && document.compatMode=="CSS1Compat" && window.XMLHttpRequest; //not IE or IE7+ browsers in standards mode
mainobj.$body=(window.opera)? (document.compatMode=="CSS1Compat"? $('html') : $('body')) : $('html,body');

//包含#topcontrol这个div
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:'Scroll Back to Top'})
.click(function(){mainobj.scrollup(); return false;})
.appendTo('body');

if (document.all && !window.XMLHttpRequest && mainobj.$control.text()!=”) {//loose check for IE6 and below, plus whether control contains any text
mainobj.$control.css({width:mainobj.$control.width()}); //IE6- seems to require an explicit width on a DIV containing text
};

mainobj.togglecontrol();

//点击控制
$('a[href="' + mainobj.anchorkeyword +'"]').click(function(){
    mainobj.scrollup();
    return false;
});

$(window).bind('scroll resize', function(e){
    mainobj.togglecontrol();
});
});
}
};

scrolltotop.init();