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Js-dom: Basic Real---Click Back to Top

Source: Internet
Author: User
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CSS Section

<style type= "Text/css" >
body{
height:3000px;
}
#div1 {
height:100px;
width:100px;
Background-color: #ccc;
position:fixed;
right:0;
bottom:0;
}
</style>

HTML section

<body>
<div id= "Div1" ></div>
UL>LI{$}*50--->tab
</body>

Js-dom part

<script type= "Text/javascript" src= "Tween.js" ></script>

<script>

Window.onload=function () {

var Odiv=document.getelementbyid ("Div1");

function Move () {

if (Window.navigator.uesrAgent.indexOf ("MSIE 6")!=-1) {

var bodyscrolltop=document.documentelement.scrolltop;

var scrollbottom=document.documentelement.clientheight-odiv.offsetheight+bodyscrolltop;

odiv.style.position= "Absolute";

odiv.style.top=scrollbottom+ "px";

}

}

Move ();

　　

Window.onscroll=window.onresize=function () {

Move ();

}

var timer=null;

Odiv.onclick=function () {

var start=document.documentelement.scrolltop| | Document.body.scrollTop;

var end=0;

var Change=end-start;

var t=0;

var endt=20;

Clearinterval (timer);

Timer=setinterval (function () {

t++;

if (T==endt) {

Clearinterval (timer);

}

Document.body.scrolltop=tween.bounce.easeout (T,start,change,endt);

Document.documentelement.scrolltop=tween.bounce.easeout (T,start,change,endt);

},30);

}

}

</script>

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