Javascript:Go to top of page

<!-- this script got from www.javascriptfreecode.com-Coded by: Krishna Eydatoula -->
<!-- START OF Watermark Jump to Top Link DHTML -->


<!-- SUMMARY BRIEF

    This DHTML script will put a small watermark
    link in the bottom right corner of your page
    that will stay there even when the page scrolls.
    This link will always take the user back to
    the top of the page.

-->


<!-- Put this portion of the script inside of your <HEAD> tag -->


<script>
<!--

// Change this text to the text that you want to be displayed as the link on your page.

var displayed="<nobr><font size=2 face=Arial><b>[Top]</b></font></nobr>"

// === DO NOT EDIT ANYTHING BELOW THIS LINE!!! === //

var logolink='javascript:window.scrollTo(0,0)'
var ns4=document.layers
var ie4=document.all
var ns6=document.getElementById&&!document.all

function regenerate(){
window.location.reload()
}
function regenerate2(){
if (ns4)
setTimeout("window.onresize=regenerate",400)
}

if (ie4||ns6)
document.write('<span id="logo" style="position:absolute;top:-300;z-index:100">'+displayed+'</span>')

function createtext(){ //function for NS4
staticimage=new Layer(5)
staticimage.left=-300
staticimage.document.write('<a href="'+logolink+'">'+displayed+'</a>')
staticimage.document.close()
staticimage.visibility="show"
regenerate2()
staticitns()
}

function staticit(){ //function for IE4/ NS6
var w2=ns6? pageXOffset+w : document.body.scrollLeft+w
var h2=ns6? pageYOffset+h : document.body.scrollTop+h
crosslogo.style.left=w2
crosslogo.style.top=h2
}

function staticit2(){ //function for NS4
staticimage.left=pageXOffset+window.innerWidth-staticimage.document.width-28
staticimage.top=pageYOffset+window.innerHeight-staticimage.document.height-10
}

function inserttext(){ //function for IE4/ NS6
if (ie4)
crosslogo=document.all.logo
else if (ns6)
crosslogo=document.getElementById("logo")
crosslogo.innerHTML='<a href="'+logolink+'">'+displayed+'</a>'
w=ns6? window.innerWidth-crosslogo.offsetWidth-20 : document.body.clientWidth-crosslogo.offsetWidth-10
h=ns6? window.innerHeight-crosslogo.offsetHeight-15 : document.body.clientHeight-crosslogo.offsetHeight-10
crosslogo.style.left=w
crosslogo.style.top=h
if (ie4)
window.onscroll=staticit
else if (ns6)
startstatic=setInterval("staticit()",100)
}

if (ie4||ns6){
window.onload=inserttext
window.onresize=new Function("window.location.reload()")
}
else if (ns4)
window.onload=createtext

function staticitns(){ //function for NS4
startstatic=setInterval("staticit2()",90)
}

//-->
</script>


<!-- END OF Watermark Jump to Top Link DHTML -->
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原文地址:https://www.cnblogs.com/zzh/p/1332228.html