js仿土豆網帶縮略圖的焦點圖片切換效果實現方法

作者：Eve Cole 更新時間：2025-05-30 13:00:04

本文實例講述了js仿土豆網帶縮略圖的焦點圖片切換效果實現方法。分享給大家供大家參考。具體實現方法如下：

複製代碼代碼如下:<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<head>

<title>仿土豆網帶縮略圖的焦點圖片切換效果</title>

/* Reset style */

* { margin:0; padding:0; word-break:break-all; }

body { background:#FFF; color:#333; font:12px/1.6em Helvetica, Arial, sans-serif; }

h1, h2, h3, h4, h5, h6 { font-size:1em; }

a { color:#039; text-decoration:none; }

a:hover { text-decoration:underline; }

ul, li { list-style:none; }

fieldset, img { border:none; }

em, strong, cite, th { font-style:normal; font-weight:normal; }

/* Focus_change style */

#focus_change { position:relative; width:450px; height:295px; overflow:hidden; margin:20px 0 1px 60px; }

#focus_change_list { position:absolute; width:1800px; height:295px; }

#focus_change_list li { float:left; }

#focus_change_list li img { width:450px; height:295px; }

.focus_change_opacity { position:absolute; width:450px; height:70px; top:225px; left:0; background:#000; filter:alpha(opacity=50); -moz-opacity:0.5; opacity: 0.5; }

#focus_change_btn { position:absolute; width:450px; height:65px; top:225px; left:0; }

#focus_change_btn ul { padding-left:5px; }

#focus_change_btn li { display:inline; float:left; margin:0 15px; padding-top:12px; }

#focus_change_btn li img { width:76px; height:50px; border:2px solid #888; }

#focus_change_btn .current { background:url(/uploadfile/200901/1/6C164133877.gif) no-repeat 37px 8px;}

#focus_change_btn .current img { border-color:#EEE; }

</style>

function $(id) { return document.getElementById(id); }

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(){

var focusBtnList = $('focus_change_btn').getElementsByTagName('li');

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

focusBtnList[i].className='';

}

function focusChange() {

var focusBtnList = $('focus_change_btn').getElementsByTagName('li');

focusBtnList[0].onmouseover = function() {

moveElement('focus_change_list',0,0,5);

classNormal()

focusBtnList[0].className='current'

}

focusBtnList[1].onmouseover = function() {

moveElement('focus_change_list',-450,0,5);

classNormal()

focusBtnList[1].className='current'

}

focusBtnList[2].onmouseover = function() {

moveElement('focus_change_list',-900,0,5);

classNormal()

focusBtnList[2].className='current'

}

focusBtnList[3].onmouseover = function() {

moveElement('focus_change_list',-1350,0,5);

classNormal()

focusBtnList[3].className='current'

}

setInterval('autoFocusChange()', 5000);

var atuokey = false;

function autoFocusChange() {

$('focus_change').onmouseover = function(){atuokey = true}

$('focus_change').onmouseout = function(){atuokey = false}

if(atuokey) return;

var focusBtnList = $('focus_change_btn').getElementsByTagName('li');

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

if (focusBtnList[i].className == 'current') {

var currentNum = i;

}

if (currentNum==0 ){

moveElement('focus_change_list',-450,0,5);

classNormal()

focusBtnList[1].className='current'

}

if (currentNum==1 ){

moveElement('focus_change_list',-900,0,5);

classNormal()

focusBtnList[2].className='current'

}

if (currentNum==2 ){

moveElement('focus_change_list',-1350,0,5);

classNormal()

focusBtnList[3].className='current'

}

if (currentNum==3 ){

moveElement('focus_change_list',0,0,5);

classNormal()

focusBtnList[0].className='current'

}

window.onload=function(){

focusChange();

}

</script>

</head>

<body>

<ul>

</ul>

</div>

<ul>

</ul>

</div>

</div>

</body>

</html>

希望本文所述對大家的javascript程序設計有所幫助。