JS焦点图切换，上下翻转_典型特效

 代码如下:







function $(id){return document.getElementById(id)}
function moveElement(elementID,final_x,final_y,interval) {//这个方法在DOM艺术那个书上讲的很清楚
if (!document.getElementById) return false;
if (!document.getElementById(elementID)) return false;
var elem = document.getElementById(elementID);
if (elem.movement) {
clearTimeout(elem.movement);
}
if (!elem.style.left) {
elem.style.left = "0px";
}
if (!elem.style.top) {
elem.style.top = "0px";
}
var xpos = parseInt(elem.style.left);
var ypos = parseInt(elem.style.top);
if (xpos == final_x && ypos == final_y) {
return true;
}
if (xpos < final_x) {
var dist = Math.ceil((final_x - xpos)/10);
xpos = xpos + dist;
}
if (xpos > final_x) {
var dist = Math.ceil((xpos - final_x)/10);
xpos = xpos - dist;
}
if (ypos < final_y) {
var dist = Math.ceil((final_y - ypos)/10);
ypos = ypos + dist;
}
if (ypos > final_y) {
var dist = Math.ceil((ypos - final_y)/10);
ypos = ypos - dist;
}
elem.style.left = xpos + "px";
elem.style.top = ypos + "px";
var repeat = "moveElement('"+elementID+"',"+final_x+","+final_y+","+interval+")";
elem.movement = setTimeout(repeat,interval);
}
function imgChange(num){//切换图片焦点
if(!$('play')) return false;
var piclist=$('playimg').getElementsByTagName('img');
var imgheight=piclist[0].offsetHeight;
var moveY=-(imgheight*num);
moveElement('playimg',0,moveY,5);
}
function classToggle(arr,n){//切换按钮样式
for(var i=0;iarr[i].className='';
}
arr[n].className='current';
}
function btnChange(btns){//鼠标移动播放
if(!$(btns)) return false;
$('play').onmouseover = function(){autokey = false};
$('play').onmouseout = function(){autokey = true};
var arr=$(btns).getElementsByTagName('li');
for(var i=0;iarr[i].index=i;//设置索引号
arr[i].onmouseover=function(){
//var num=index(this,arr);
classToggle(arr,this.index);
imgChange(this.index);
}
}
}
function autoChange(btns){
if(!$(btns)) return false;
if(!autokey) return false;
var arr=$(btns).getElementsByTagName('li');
for(var i=0;iif(arr[i].className=='current'){
var n=i+1;
}
}
if(n>=arr.length) n=0;
classToggle(arr,n);
imgChange(n);
}
var autokey = true;
setInterval("autoChange('playbtn')",3000);
window.onload=function(){
btnChange('playbtn');
}

1

2

3

4