返回顶部，纯js带动画效果

2016-07-11 网页编程网 网页编程网

<html><head>
<style type="text/css">
#container{
text-align: left;
background-color: #faf7ec;
width: 500px;
margin: 20px auto 0 auto;
padding: 0;
font-family:Arial, Helvetica, sans-serif;
font-size:12px;
}
#block0, #block1, #block2, #block3, #block4, #block5 {
border-top: solid 1px #785a3c;
margin: 0;
padding: 10px;
}
.active {
background-color: #fff;
}
.visited {
background-color: #ede7da;
}
#block0, #block0.active, #block0.visited {
text-align: center;
background-color: #a0dcf8;
border-top: none;
border-bottom: solid 4px #785a3c;
}
</style>
<script>
var ScrollWin = {
w3c : document.getElementById,
iex : document.all,
scrollLoop : false,
scrollInterval : null, // setInterval id
currentBlock : null,   // object reference
getWindowHeight : function(){
if(this.iex) return (document.documentElement.clientHeight) ?
document.documentElement.clientHeight : document.body.clientHeight;
else return window.innerHeight;
},
getScrollLeft : function(){
if(this.iex) return (document.documentElement.scrollLeft) ?
document.documentElement.scrollLeft : document.body.scrollLeft;
else return window.pageXOffset;
},
getScrollTop : function(){
if(this.iex) return (document.documentElement.scrollTop) ?
document.documentElement.scrollTop : document.body.scrollTop;
else return window.pageYOffset;
},
getElementYpos : function(el){
var y = 0;
while(el.offsetParent){
y += el.offsetTop
el = el.offsetParent;
}
return y;
},
scroll : function(num){
if(!this.w3c){
location.href = "#"+this.anchorName+num;
return;
}
if(this.scrollLoop){
clearInterval(this.scrollInterval);
this.scrollLoop = false;
this.scrollInterval = null;
}
if(this.currentBlock != null) this.currentBlock.className = this.offClassName;
this.currentBlock = document.getElementById(this.blockName+num);
this.currentBlock.className = this.onClassName;
var doc = document.getElementById(this.containerName);
var documentHeight = this.getElementYpos(doc) + doc.offsetHeight;
var windowHeight = this.getWindowHeight();
var ypos = this.getElementYpos(this.currentBlock);
if(ypos > documentHeight - windowHeight) ypos = documentHeight - windowHeight;
this.scrollTo(0,ypos);
},
scrollTo : function(x,y){
if(this.scrollLoop){
var left = this.getScrollLeft();
var top = this.getScrollTop();
if(Math.abs(left-x) <= 1 && Math.abs(top-y) <= 1){
window.scrollTo(x,y);
clearInterval(this.scrollInterval);
this.scrollLoop = false;
this.scrollInterval = null;
}else{
window.scrollTo(left+(x-left)/10, top+(y-top)/10);
}
}else{
this.scrollInterval = setInterval("ScrollWin.scrollTo("+x+","+y+")",20);
this.scrollLoop = true;
}
}
};
ScrollWin.containerName = "container";
ScrollWin.anchorName    = "anchor";
ScrollWin.blockName     = "block";
ScrollWin.onClassName   = "active";
ScrollWin.offClassName  = "visited";
</script>
</head>
<body>
<div align="center">
<div id="container">
<a name="anchor0"></a>
<div id="block0">
<a href="javascript:ScrollWin.scroll('1')">链接 1</a> |
<a href="javascript:ScrollWin.scroll('2')">链接 2</a> |
<a href="javascript:ScrollWin.scroll('3')">链接 3</a> |
<a href="javascript:ScrollWin.scroll('4')">链接 4</a> |
<a href="javascript:ScrollWin.scroll('5')">链接 5</a>
</div>
<a name="anchor1"></a>
<div id="block1">
<h3><a href="#" onclick="javascript:ScrollWin.scroll('0'); return false;">顶部</a>
链接 1</h3>
<p>内容</p>
<p>内容</p>
<p>内容</p>
<p>内容</p>
<p>内容</p>
<p>内容</p>
<p>内容</p>
<p>内容</p>
</div>
<a name="anchor2"></a>
<div id="block2">
<h3><a href="#" onclick="javascript:ScrollWin.scroll('0'); return false;">顶部</a>
链接 2</h3>
<p>内容</p>
<p>内容</p>
<p>内容</p>
<p>内容</p>
<p>内容</p>
<p>内容</p>
<p>内容</p>
<p>内容</p>
</div>
<a name="anchor3"></a>
<div id="block3">
<h3><a href="#" onclick="javascript:ScrollWin.scroll('0'); return false;">顶部</a>
链接 3</h3>
<p>内容</p>
<p>内容</p>
<p>内容</p>
<p>内容</p>
<p>内容</p>
<p>内容</p>
<p>内容</p>
<p>内容</p>
</div>
<a name="anchor4"></a>
<div id="block4">
<h3><a href="#" onclick="javascript:ScrollWin.scroll('0'); return false;">顶部</a>
链接 4</h3>
<p>内容</p>
<p>内容</p>
<p>内容</p>
<p>内容</p>
<p>内容</p>
<p>内容</p>
<p>内容</p>
<p>内容</p>
</div>
<a name="anchor5"></a>
<div id="block5">
<h3><a href="#" onclick="javascript:ScrollWin.scroll('0'); return false;">顶部</a>
链接 5</h3>
<p>内容</p>
<p>内容</p>
<p>内容</p>
<p>内容</p>
<p>内容</p>
<p>内容</p>
<p>内容</p>
<p>内容</p>
</div>
</div>
</div>
</body></html>

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