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如何用JS实现返回顶部？
第一种
/**
* JavaScript脚本实现回到页面顶部示例
* @param acceleration 速度
* @param stime 时间间隔 (毫秒)
**/
function gotoTop(acceleration,stime) {
acceleration = acceleration || 0.1;
stime = stime || 10;
var x1 = 0;
var y1 = 0;
var x2 = 0;
var y2 = 0;
var x3 = 0;
var y3 = 0;
if (document.documentElement) {
x1 = document.documentElement.scrollLeft || 0;
y1 = document.documentElement.scrollTop || 0;
}
if (document.body) {
x2 = document.body.scrollLeft || 0;
y2 = document.body.scrollTop || 0;
}
var x3 = window.scrollX || 0;
var y3 = window.scrollY || 0;
// 滚动条到页面顶部的水平距离
var x = Math.max(x1, Math.max(x2, x3));
// 滚动条到页面顶部的垂直距离
var y = Math.max(y1, Math.max(y2, y3));
// 滚动距离 = 目前距离 / 速度, 因为距离原来越小, 速度是大于 1 的数, 所以滚动距离会越来越小
var speeding = 1 + acceleration;
window.scrollTo(Math.floor(x / speeding), Math.floor(y / speeding));
// 如果距离不为零, 继续调用函数
if(x gt; 0 || y gt; 0) {
var run = "gotoTop(" + acceleration + ", " + stime + ")";
window.setTimeout(run, stime);
}
}
第二种
function pageScroll() {
window.scrollBy(0,-10);
scrolldelay = setTimeout('pageScroll()',100);
}
/*
scrollBy() 方法可把内容滚动指定的像素数。
语法
scrollBy(xnum,ynum)
参数描述
xnum 必需。把文档向右滚动的像素数。
ynum 必需。把文档向下滚动的像素数。
8?
相关问答
Q1: 做了个网站 在网上下载了 css和 js 还有个 indx 怎么移植到自己的网页中 素材在懒人图库下载的 菜鸟级别
1、css文件夹和js文件夹里面的css和js文件引入你的页面里面。
2、把index.html里面的HTML代码部分复制到你的页面。然后预览效果。
3、然后把具体的参数调一下，比如下载了个焦点图，可以把宽度和高度之类的调成你所需要的。
如果还不是很明白，可以加js代码交流群：304683253
Q2: JavaScript 的网页图片切换代码
!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" ""
html xmlns=""
head
meta http-equiv="Content-Type" content="text/html; charset=gb2312"
title网页特效 首页图片切换/title
style type="text/css"
/* Reset style */
* { margin:0; padding:0; word-break:break-all; }
body {
background:#fff;
color:#000000;
font:12px/1.6em Helvetica, Arial, sans-serif;
margin-left: 0px;
margin-top: 0px;
margin-right: 0px;
margin-bottom: 0px;
}
h1, h2, h3, h4, h5, h6 { font-size:1em; }
a { color:#0287CA; text-decoration:none; }
a:hover { text-decoration:underline; }
ul, li { list-style:none; }
fieldset, img { border:none; }
legend { display:none; }
em, strong, cite, th { font-style:normal; font-weight:normal; }
input, textarea, select, button { font:12px Helvetica, Arial, sans-serif; }
table { border-collapse:collapse; }
html { overflow:-moz-scrollbars-vertical; } /*Always show Firefox scrollbar*/
/* iFocus style */
#ifocus { width:650px; height:245px; margin:0px; border:1px solid #DEDEDE; background:#F8F8F8; }
#ifocus_pic { display:inline; position:relative; float:left; width:540px; height:225px; overflow:hidden; margin:10px 0 0 10px; }
#ifocus_piclist { position:absolute; }
#ifocus_piclist li { width:550px; height:225px; overflow:hidden; }
#ifocus_piclist img { width:550px; height:225px; }
#ifocus_btn { display:inline; float:right; width:91px; margin:9px 9px 0 0; }
#ifocus_btn li { width:91px; height:57px; cursor:pointer; opacity:0.5; -moz-opacity:0.5; filter:alpha(opacity=50); }
#ifocus_btn img { width:75px; height:45px; margin:7px 0 0 11px; }
#ifocus_btn .current { background: url(img/ifocus_btn_bg.gif) no-repeat; opacity:1; -moz-opacity:1; filter:alpha(opacity=100); }
#ifocus_opdiv { position:absolute; left:0; bottom:0; width:545px; height:35px; background:#000; opacity:0.5; -moz-opacity:0.5; filter:alpha(opacity=50); }
#ifocus_tx { position:absolute; left:8px; bottom:8px; color:#FFF; }
#ifocus_tx .normal { display:none; }
/style
script type="text/javascript"
function $(id) { return document.getElementById(id); }
function addLoadEvent(func){
var oldonload = window.onload;
if (typeof window.onload != 'function') {
window.onload = func;
} else {
window.onload = function(){
oldonload();
func();
}
}
}
function moveElement(elementID,final_x,final_y,interval) {
if (!document.getElementById) return false;
if (!document.getElementById(elementID)) return false;
var elem = document.getElementById(elementID);
if (elem.movement) {
clearTimeout(elem.movement);
}
if (!elem.style.left) {
elem.style.left = "0px";
}
if (!elem.style.top) {
elem.style.top = "0px";
}
var xpos = parseInt(elem.style.left);
var ypos = parseInt(elem.style.top);
if (xpos == final_x ypos == final_y) {
return true;
}
if (xpos final_x) {
var dist = Math.ceil((final_x - xpos)/10);
xpos = xpos + dist;
}
if (xpos final_x) {
var dist = Math.ceil((xpos - final_x)/10);
xpos = xpos - dist;
}
if (ypos final_y) {
var dist = Math.ceil((final_y - ypos)/10);
ypos = ypos + dist;
}
if (ypos final_y) {
var dist = Math.ceil((ypos - final_y)/10);
ypos = ypos - dist;
}
elem.style.left = xpos + "px";
elem.style.top = ypos + "px";
var repeat = "moveElement('"+elementID+"',"+final_x+","+final_y+","+interval+")";
elem.movement = setTimeout(repeat,interval);
}
function classNormal(iFocusBtnID,iFocusTxID){
var iFocusBtns= $(iFocusBtnID).getElementsByTagName('li');
var iFocusTxs = $(iFocusTxID).getElementsByTagName('li');
for(var i=0; iiFocusBtns.length; i++) {
iFocusBtns[i].className='normal';
iFocusTxs[i].className='normal';
}
}
function classCurrent(iFocusBtnID,iFocusTxID,n){
var iFocusBtns= $(iFocusBtnID).getElementsByTagName('li');
var iFocusTxs = $(iFocusTxID).getElementsByTagName('li');
iFocusBtns[n].className='current';
iFocusTxs[n].className='current';
}
function iFocusChange() {
if(!$('ifocus')) return false;
$('ifocus').onmouseover = function(){atuokey = true};
$('ifocus').onmouseout = function(){atuokey = false};
var iFocusBtns = $('ifocus_btn').getElementsByTagName('li');
var listLength = iFocusBtns.length;
iFocusBtns[0].onmouseover = function() {
moveElement('ifocus_piclist',0,0,5);
classNormal('ifocus_btn','ifocus_tx');
classCurrent('ifocus_btn','ifocus_tx',0);
}
if (listLength=2) {
iFocusBtns[1].onmouseover = function() {
moveElement('ifocus_piclist',0,-225,5);
classNormal('ifocus_btn','ifocus_tx');
classCurrent('ifocus_btn','ifocus_tx',1);
}
}
if (listLength=3) {
iFocusBtns[2].onmouseover = function() {
moveElement('ifocus_piclist',0,-450,5);
classNormal('ifocus_btn','ifocus_tx');
classCurrent('ifocus_btn','ifocus_tx',2);
}
}
if (listLength=4) {
iFocusBtns[3].onmouseover = function() {
moveElement('ifocus_piclist',0,-675,5);
classNormal('ifocus_btn','ifocus_tx');
classCurrent('ifocus_btn','ifocus_tx',3);
}
}
}
setInterval('autoiFocus()',3500);
var atuokey = false;
function autoiFocus() {
if(!$('ifocus')) return false;
if(atuokey) return false;
var focusBtnList = $('ifocus_btn').getElementsByTagName('li');
var listLength = focusBtnList.length;
for(var i=0; ilistLength; i++) {
if (focusBtnList[i].className == 'current') var currentNum = i;
}
if (currentNum==0listLength!=1 ){
moveElement('ifocus_piclist',0,-225,5);
classNormal('ifocus_btn','ifocus_tx');
classCurrent('ifocus_btn','ifocus_tx',1);
}
if (currentNum==1listLength!=2 ){
moveElement('ifocus_piclist',0,-450,5);
classNormal('ifocus_btn','ifocus_tx');
classCurrent('ifocus_btn','ifocus_tx',2);
}
if (currentNum==2listLength!=3 ){
moveElement('ifocus_piclist',0,-675,5);
classNormal('ifocus_btn','ifocus_tx');
classCurrent('ifocus_btn','ifocus_tx',3);
}
if (currentNum==3 ){
moveElement('ifocus_piclist',0,0,5);
classNormal('ifocus_btn','ifocus_tx');
classCurrent('ifocus_btn','ifocus_tx',0);
}
if (currentNum==1listLength==2 ){
moveElement('ifocus_piclist',0,0,5);
classNormal('ifocus_btn','ifocus_tx');
classCurrent('ifocus_btn','ifocus_tx',0);
}
if (currentNum==2listLength==3 ){
moveElement('ifocus_piclist',0,0,5);
classNormal('ifocus_btn','ifocus_tx');
classCurrent('ifocus_btn','ifocus_tx',0);
}
}
addLoadEvent(iFocusChange);
/script
/head
body
br /
div align="center"
div id="ifocus"
div id="ifocus_pic"
div id="ifocus_piclist" style="left:0; top:0;"
ul
lia href="#" target="_blank"img src="/edu/img/js/200909/1.jpg" alt="武林三国" border="0" //a/li
lia href="#" target="_blank"img src="/edu/img/js/200909/2.jpg" alt="武林英雄" border="0" //a/li
lia href="#" target="_blank"img src="/edu/img/js/200909/3.jpg" alt="商业大亨" border="0" //a/li
lia href="#" target="_blank"img src="/edu/img/js/200909/4.jpg" alt="帝国远征" border="0" //a/li
/ul
/div
div id="ifocus_opdiv"/div
div id="ifocus_tx"
ul
li class="current"2008年度排名第一的网页游戏/li
li class="normal"2009年最新的网页游戏 /li
li class="normal"商业大亨，挑战亿万富翁/li
li class="normal"一款2009年不得不玩的帝国远征/li
/ul
/div
/div
div id="ifocus_btn"
ul
li class="current"img src="/edu/img/js/200909/s1.jpg" alt="" //li
li class="normal"img src="/edu/img/js/200909/s2.jpg" alt="" //li
li class="normal"img src="/edu/img/js/200909/s3.jpg" alt="" //li
li class="normal"img src="/edu/img/js/200909/s4.jpg" alt="" //li
/ul
/div
/div
/div
/body
/html
自己改图片链接和大小~~
Q3: JS如何实现图片滑动？
script language="javascript" type="text/javascript"
//图片滚动展示 Start
var counts = 4;
//大图//
img1 = new Image();
img1.src = 'images/1.jpg';
img2 = new Image();
img2.src = 'images/2.jpg';
img3 = new Image();
img3.src = 'images/3.jpg';
img4 = new Image();
img4.src = 'images/4.jpg';
var smallImg = new Array();
//小图
smallImg[0] = 'images/index_adb1.gif';
smallImg[1] = 'images/index_adb2.gif';
smallImg[2] = 'images/index_adb3.gif';
smallImg[3] = 'images/index_adb4.gif';
//链接地址
url1 = new Image();
url1.src = ' ';
url2 = new Image();
url2.src = ' ';
url3 = new Image();
url3.src = ' ';
url4=new Image();
url4.src=' '
//alt值
alt1 = new Image();
alt1.alt = '';
alt2 = new Image();
alt2.alt = '';
alt3 = new Image();
alt3.alt = ' ';
alt4 = new Image();
alt4.alt='';
////欢迎来到标准之路.
var nn = 1;
var key = 0;
function change_img() {
if (key == 0) {
key = 1;
} else if (document.all) {
document.getElementById("pic").filters[0].Apply();
document.getElementById("pic").filters[0].Play(duration = 2);
}
eval('document.getElementById("pic").src=img' + nn + '.src');
eval('document.getElementById("url").href=url' + nn + '.src');
eval('document.getElementById("pic").alt=alt' + nn + '.alt');
if (nn == 1) {
document.getElementById("url").target = "_blank";
document.getElementById("url").style.cursor = "pointer";
} else {
document.getElementById("url").target = "_blank"
document.getElementById("url").style.cursor = "pointer"
}
for ( var i = 1; i = counts; i++) {
document.getElementById("xxjdjj" + i).className = 'axx';
}
document.getElementById("xxjdjj" + nn).className = 'bxx';
nn++;
if (nn counts) {
nn = 1;
}
tt = setTimeout('change_img()', 7000);
}
function changeimg(n) {
nn = n;
window.clearInterval(tt);
change_img();
}
function imageshow() {
document.write('div class="picshow_main"');
document.write('diva id="url"img id="pic" class="imgbig" //a/div');
document.write('div class="picshow_change"');
for ( var i = 0; i counts; i++) {
document.write('a href="javascript:changeimg(' + (i + 1)
+ ');" id="xxjdjj' + (i + 1)
+ '" class="axx" target="_self"img src="' + smallImg[i]
+ '"/a');
}
document.write('/div/div');
change_img();
}
//图片滚动展示 End
/script
script language="javascript" type="text/javascript"
imageshow();
/script
Q4: 网页导航制作一个上拉菜单，css实现
这种东西网上很多，想懒人图库，脚本之家等什么的，javascript实现挺好的，调下兼容性就可以了。你看这个链接合适吗
Q5: js或jquery怎么实现div的轮转换效果？
很顺畅的1号：
传送门：
漂亮的2号：
传送门：
特别帅的3号：
传送门：
