如何用JavaScript 實(shí)現(xiàn) iOSwebView里面Html界面導(dǎo)航欄置頂效果

//記錄導(dǎo)航條原來在頁面上的位置

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var naviga_offsetTop = 0;

var naviga_offsetLeft = 0;

//IE7不識(shí)別getElementsByClassName，為了兼容自定義一個(gè)

function my_getElementsByClassName(class_name) {

var el = [];

//獲取所有元素

_el = document.getElementsByTagName('*');

//通過className刷選

for (var i=0; i_el.length; i++ ) {

if (_el[i].className == class_name ) {

el[el.length] = _el[i];

}

}

return el;

}

//導(dǎo)航條，懸停在頂部

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;

//如果向下滾動(dòng)的距離大于原來導(dǎo)航欄離頂部的距離

//直接將導(dǎo)航欄固定到可視區(qū)頂部

if( scrollTop naviga_offsetTop ){

a_navigation_bar[0].style.top = 0 + "px";

} else {

//如果向下滾動(dòng)的距離小原來導(dǎo)航欄離頂部的距離，則重新計(jì)算導(dǎo)航欄的位置

a_navigation_bar[0].style.top = (naviga_offsetTop - scrollTop) + "px";

}

}

//給導(dǎo)航條上四個(gè)tab，加上點(diǎn)擊事件。

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");

}

//獲取offsetLeft，即導(dǎo)航欄離左邊框的距離

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);

}

//獲取頁面上，導(dǎo)航條到頂部的位置

var a_navigation_bar = [];

if(document.getElementsByClassName){//Chrome, FF

a_navigation_bar = document.getElementsByClassName("navigation");

} else {//IE

a_navigation_bar = my_getElementsByClassName("navigation");

}

//獲取offsetTop

naviga_offsetTop = a_navigation_bar[0].offsetTop;

a_navigation_bar[0].style.left = naviga_offsetLeft + "px";

//給滾動(dòng)條以及鼠標(biāo)加上滾動(dòng)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);

}

}

導(dǎo)航欄的javascript代碼(點(diǎn)擊導(dǎo)航欄上鏈接時(shí)。背景圖片改成相應(yīng)的圖片，并且刷新也不會(huì)變

用Cookies可以實(shí)現(xiàn)，這個(gè)不太好表達(dá)，就是把初始值保存在Cookie中，在根據(jù)用戶的操作回寫Cookie，讀取Cookie的參數(shù)就可以了，刷新也沒關(guān)系

純js怎樣實(shí)現(xiàn)網(wǎng)站導(dǎo)航欄的切換？

html

head

meta http-equiv="Content-Type" content="text/html; charset=gb2312"

title多選項(xiàng)切換導(dǎo)航菜單/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='#'當(dāng)前位置：首頁"

links[1]="a href='#'項(xiàng)目一/a | a href='#'項(xiàng)目二/a | a href='#'項(xiàng)目三/a | a href='#'項(xiàng)目四/a"

links[2]="a href='#'項(xiàng)目一/a | a href='#'項(xiàng)目二/a | a href='#'項(xiàng)目三/a"

links[3]="a href='#'項(xiàng)目一/a | a href='#'項(xiàng)目二/a | a href='#'項(xiàng)目三/a | a href='#'項(xiàng)目四/a | a href='#'項(xiàng)目五/a"

links[4]="a href='#'項(xiàng)目一/a | a href='#'項(xiàng)目二/a"

links[5]="a href='#'項(xiàng)目一/a | a href='#'項(xiàng)目二/a | a href='#'項(xiàng)目三/a"

links[6]="a href='#'項(xiàng)目一/a | a href='#'項(xiàng)目二/a"

links[7]="a href='#'項(xiàng)目一/a | a href='#'項(xiàng)目二/a"

links[8]="a href='#'項(xiàng)目一/a | a href='#'項(xiàng)目二/a"

links[9]="a href='#'項(xiàng)目一/a | a href='#'項(xiàng)目二/a"

links[10]="a href='#'項(xiàng)目一/a| a href='#'項(xiàng)目二/a"

links[11]="a href='#'項(xiàng)目一/a | a href='#'項(xiàng)目二/a"

links[12]="a href='#'項(xiàng)目一/a | a href='#'項(xiàng)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首頁/lili娛樂快報(bào)/lili音樂天地/lili極品FLASH/li

/div

div id="subMenu"站務(wù)公告/div

/body

/html

請(qǐng)教javascript導(dǎo)航欄效果

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"首頁/li

li測試1/li

li測試2/li

li撒謊測試3/li

li測試4/li

li測試5/li

li測試6/li

li測fdf豆腐干阿薩德試7/li

/ul

/body

/html

網(wǎng)站題目：javascript導(dǎo)航欄,javascript導(dǎo)航欄制作
標(biāo)題來源：http://chinadenli.net/article15/dsghcgi.html

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