关于Blog顶部的滚动导航条代码

日期：2020-06-13 栏目：程序人生浏览：次

不少朋友通过各种方式问我要 Blog 顶部的滚动导航菜单的代码。其实也没什么特别的，但既然有需求，我就还是把这部分代码整理出来，供大家参考。

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<HEAD>
<TITLE>Float Div</TITLE>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<style type="text/css">
#zealNavigatorBar {
    position: absolute;
    z-index: 100;
    width: 760px;
    height: 32px;
    line-height: 32px;
    top: 0px;
    left: 0px;
    padding: 0px;
    margin: 0px;
    border-bottom:1px solid #646465;
    background-color: #C0C0C3;
}
</style>
</HEAD>

<BODY>
<div id=zealNavigatorBar>
 <a href="https://www.jb51.net/">Anything here</a> 
 <a href="https://www.jb51.net/">Anything here</a> 
 <a href="https://www.jb51.net/">Anything here</a> 
</div>
<script language="JavaScript">
for(var t=0;t<1000;t++) document.writeln('Test content: line '+t+'<br />');
</script>
<script language="JavaScript">
var g_myBodyInstance = document.body;
var g_myBodyInstanceString = "document.body";
if(document.compatMode != "BackCompat"){
    // for looser.dtd
    g_myBodyInstance = document.documentElement;
    g_myBodyInstanceString = "document.documentElement";
}
var isMinNS4 = (navigator.appName.indexOf("Netscape") >= 0 &&
                parseFloat(navigator.appVersion) >= 4) ? 1 : 0;
var isMinNS5 = (navigator.appName.indexOf("Netscape") >= 0 &&
                parseFloat(navigator.appVersion) >= 5) ? 1 : 0;
var isMinIE4 = (document.all) ? 1 : 0;
var isMinIE5 = (isMinIE4 && navigator.appVersion.indexOf("5.") >= 0) ? 1 : 0;
var isMacIE = (isMinIE4 && navigator.userAgent.indexOf("Mac") >= 0) ? 1 : 0;

var getFFVersion=navigator.userAgent.substring(
                    navigator.userAgent.indexOf("Firefox")).split("https://www.jb51.net/")[1];
//extra height in px to add to iframe in FireFox 1.0+ browsers
var FFextraHeight=getFFVersion<1.5? 16 : 0;

function getLayer(name) {
  if (isMinNS5)
    return document.getElementById(name);
  else if (isMinIE4)
    return eval('document.all.' + name);
  else if (isMinNS4)
    return findLayer(name, document);

  return null;
}

function findLayer(name, doc) {

  var i, layer;

  for (i = 0; i < doc.layers.length; i++) {
    layer = doc.layers[i];
    if (layer.name == name)
      return layer;
    if (layer.document.layers.length > 0) {
      layer = findLayer(name, layer.document);
      if (layer != null)
        return layer;
    }
  }

  return null;
}

function moveLayerTo(layer, x, y) {
  if (isMinIE4) {
    layer.style.left = x;
    layer.style.top  = y;
  }
  else if (isMinNS5) {
    layer.style.left = x+'px';
    layer.style.top  = y+'px';
  }
  else if (isMinNS4)
    layer.moveTo(x, y);
}

function getPageLeft(layer) {

  if (isMinIE4||isMinNS5)
    return(layer.offsetLeft);
  else if (isMinNS4)
    return(layer.pageX);
  return(-1);
}

function getPageTop(layer) {

  if (isMinIE4||isMinNS5)
    return(layer.offsetTop);
  else if (isMinNS4)
    return(layer.pageY);
  return(-1);
}

function getPageScrollX() {

  if (isMinIE4||isMinNS5)
    return(g_myBodyInstance.scrollLeft);
  else if (isMinNS4)
    return(window.pageXOffset);
  return(-1);
}

function getPageScrollY() {

  if (isMinIE4||isMinNS5)
    return(g_myBodyInstance.scrollTop);
  else if (isMinNS4)
    return(window.pageYOffset);
  return(-1);
}

var g_p_zealNavigatorBar = null;
g_p_zealNavigatorBar = getLayer('zealNavigatorBar');
if(!isMinIE4){g_p_zealNavigatorBar.style.position = 'fixed';}
function reposzealNavigatorBar(){
    if(isMinIE4){
        try{
            moveLayerTo(g_p_zealNavigatorBar,
                        getPageLeft(g_p_zealNavigatorBar),
                        getPageScrollY());
        }catch(e){}
    }
}
window.onresize = reposzealNavigatorBar;
window.onscroll = reposzealNavigatorBar;
window.onload = reposzealNavigatorBar;
</script>
</BODY>
</HTML>

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