如何用JavaScript 实现 iOSwebView里面Html界面导航栏置顶效果
//记录导航条原来在页面上的位置
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var naviga_offsetTop = 0;
var naviga_offsetLeft = 0;
//IE7不识别getElementsByClassName，为了兼容自定义一个
function my_getElementsByClassName(class_name) {
var el = [];
//获取所有元素
_el = document.getElementsByTagName('*');
//通过className刷选
for (var i=0; i_el.length; i++ ) {
if (_el[i].className == class_name ) {
el[el.length] = _el[i];
}
}
return el;
}
//导航条，悬停在顶部
function naviga_stay_top(){
var a_navigation_bar = [];
if(document.getElementsByClassName){//Chrome, FF
a_navigation_bar = document.getElementsByClassName("navigation");
} else {//IE
a_navigation_bar = my_getElementsByClassName("navigation");
}
var scrollTop = document.body.scrollTop || document.documentElement.scrollTop;
document.title = scrollTop;
//如果向下滚动的距离大于原来导航栏离顶部的距离
//直接将导航栏固定到可视区顶部
if( scrollTop naviga_offsetTop ){
a_navigation_bar[0].style.top = 0 + "px";
} else {
//如果向下滚动的距离小原来导航栏离顶部的距离，则重新计算导航栏的位置
a_navigation_bar[0].style.top = (naviga_offsetTop - scrollTop) + "px";
}
}
//给导航条上四个tab，加上点击事件。
window.onload=function(){
var a_tabs = [];
if( document.getElementsByClassName ){//Chrome, FF
a_tabs = document.getElementsByClassName("tab");
}else{ //IE
a_tabs = my_getElementsByClassName("tab");
}
var a_contents = [];
if( document.getElementsByClassName ){//Chrome, FF
a_contents = document.getElementsByClassName("content");
}else{//IE
a_contents = my_getElementsByClassName("content");
}
//获取offsetLeft，即导航栏离左边框的距离
var a_main_div = [];
if( document.getElementsByClassName ){//Chrome, FF
a_main_div = document.getElementsByClassName("main");
}else{ //IE
a_main_div = my_getElementsByClassName("main");
}
naviga_offsetLeft = a_main_div[0].offsetLeft;
a_tabs[0].onclick=function(){
window.scrollTo(0, a_contents[2].offsetTop);
}
a_tabs[1].onclick=function(){
window.scrollTo(0, a_contents[3].offsetTop);
}
a_tabs[2].onclick=function(){
window.scrollTo(0, a_contents[4].offsetTop);
}
a_tabs[3].onclick=function(){
window.scrollTo(0, a_contents[5].offsetTop);
}
//获取页面上，导航条到顶部的位置
var a_navigation_bar = [];
if(document.getElementsByClassName){//Chrome, FF
a_navigation_bar = document.getElementsByClassName("navigation");
} else {//IE
a_navigation_bar = my_getElementsByClassName("navigation");
}
//获取offsetTop
naviga_offsetTop = a_navigation_bar[0].offsetTop;
a_navigation_bar[0].style.left = naviga_offsetLeft + "px";
//给滚动条以及鼠标加上滚动事件
if( window.attachEvent) //IE
{
window.attachEvent("onmousewheel", naviga_stay_top);
window.attachEvent("onscroll", naviga_stay_top);
document.attachEvent("onmousewheel", naviga_stay_top);
document.attachEvent("onscroll", naviga_stay_top);
} else {//Chrome ,FF
window.addEventListener("mousewheel", naviga_stay_top,false);
window.addEventListener("scroll", naviga_stay_top,false);
document.addEventListener("mousewheel", naviga_stay_top,false);
document.addEventListener("scroll", naviga_stay_top,false);
}
}
导航栏的javascript代码(点击导航栏上链接时。背景图片改成相应的图片，并且刷新也不会变
用Cookies可以实现，这个不太好表达，就是把初始值保存在Cookie中，在根据用户的操作回写Cookie，读取Cookie的参数就可以了，刷新也没关系
纯js怎样实现网站导航栏的切换？
html
head
meta http-equiv="Content-Type" content="text/html; charset=gb2312"
title多选项切换导航菜单/title
/head
style type="text/css"
#dNavBar{
background-color:#ffffff;
}
#dNavBar li{
list-style-type:none;
float:left;
width:84px;
height:28px;
line-height:28px;
font-size:12px;
color:#FFFFFF;
border:1px solid #ffffff;
background:#86C2FF;
text-align:center;
display:block;
cursor:pointer;
}
#subMenu{
background:#99cc66;
width:500px;
border-left:1px solid #ffffff;
border-right:1px solid #ffffff;
height:29px;
line-height:29px;
color:#FFFFFF;
font-size:12px;
padding-left:10px;
}
body {
margin: 0px;
}
a:link,a:visited {
color: #FFFFFF;
text-decoration: none;
}
a:hover{
color: #FFFFFF;
text-decoration: none;
}
/style
script language="javascript"
function ShowMenu()
{
var barCTT=document.getElementByIdx_x("dNavBar")
var liArr=barCTT.getElementsByTagName_r("li")
var links=new Array()
links[0]="a href='#'当前位置：首页"
links[1]="a href='#'项目一/a | a href='#'项目二/a | a href='#'项目三/a | a href='#'项目四/a"
links[2]="a href='#'项目一/a | a href='#'项目二/a | a href='#'项目三/a"
links[3]="a href='#'项目一/a | a href='#'项目二/a | a href='#'项目三/a | a href='#'项目四/a | a href='#'项目五/a"
links[4]="a href='#'项目一/a | a href='#'项目二/a"
links[5]="a href='#'项目一/a | a href='#'项目二/a | a href='#'项目三/a"
links[6]="a href='#'项目一/a | a href='#'项目二/a"
links[7]="a href='#'项目一/a | a href='#'项目二/a"
links[8]="a href='#'项目一/a | a href='#'项目二/a"
links[9]="a href='#'项目一/a | a href='#'项目二/a"
links[10]="a href='#'项目一/a| a href='#'项目二/a"
links[11]="a href='#'项目一/a | a href='#'项目二/a"
links[12]="a href='#'项目一/a | a href='#'项目二/a"
for (i=0;iliArr.length;i++)
{
liArr[i].onclick=function()
{
selectThis(this,liArr,links)
}
}
}
function selectThis(indexObj,allLi,infoArr)
{
var index=0;
for (i=0;iallLi.length;i++)
{
allLi[i].style.border="1px solid #ffffff";
allLi[i].style.backgroundColor="#86C2FF";
allLi[i].style.height="28px";
if (indexObj==allLi[i])
{
index=i;
}
}
indexObj.style.borderBottom="0px solid #666688";
indexObj.style.backgroundColor="#99cc66";
indexObj.style.height="31px";
document.getElementByIdx_x("subMenu").innerHTML=infoArr[index];
}
/script
body onLoad="ShowMenu()"
div id="dNavBar" style="float:none; width:560px;"li首页/lili娱乐快报/lili音乐天地/lili极品FLASH/li
/div
div id="subMenu"站务公告/div
/body
/html
请教javascript导航栏效果
html
head
style type="text/css"
ul
{
border-bottom:10px solid #efefef;
height:45px;
}
li
{
float:left;
padding:10px 20px;
border-bottom:solid #FFF 3px;
height:22px;
line-height:22px;
overflow:hidden;
}
li:hover, .sel
{
border-bottom:solid #669900 3px;
}
/style
/head
body
ul
li class="sel"首页/li
li测试1/li
li测试2/li
li撒谎测试3/li
li测试4/li
li测试5/li
li测试6/li
li测fdf豆腐干阿萨德试7/li
/ul
/body
/html
新闻标题：javascript导航栏,javascript导航栏制作
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