html:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<title>jquery制作鼠标经过图片实现上下抖动动画特效</title>
<script type="text/javascript" src="js/jquery-1.3.2.min.js"></script>
<script type="text/javascript" src="js/jump.js"></script>
<script type="text/javascript">
$(function(){
$("#ul img").each(function(k,img){
new JumpObj(img,10);
//第一个参数代表元素对象
//第二个参数代表抖动幅度
});
});
</script>
</head>
<body>
<div class="img_box">
<ul id="ul">
<li><a href="#"><img src="images/01.jpg"/></a></li>
<li><a href="#"><img src="images/02.jpg"/></a></li>
<li><a href="#"><img src="images/03.jpg"/></a></li>
<li><a href="#"><img src="images/04.jpg"/></a></li>
</ul>
</div>
</body>
</html>
jump.js:
function JumpObj(elem, range, startFunc, endFunc) {
var curMax = range = range || 6;
startFunc = startFunc || function(){};
endFunc = endFunc || function(){};
var drct = 0;
var step = 1;
init();
function init() { elem.style.position = 'relative';active() }
function active() { elem.onmouseover = function(e) {if(!drct)jump()} }
function deactive() { elem.onmouseover = null }
function jump() {
var t = parseInt(elem.style.top);
if (!drct) motionStart();
else {
var nextTop = t - step * drct;
if (nextTop >= -curMax && nextTop <= 0) elem.style.top = nextTop + 'px';
else if(nextTop < -curMax) drct = -1;
else {
var nextMax = curMax / 2;
if (nextMax < 1) {motionOver();return;}
curMax = nextMax;
drct = 1;
}
}
setTimeout(function(){jump()}, 200 / (curMax+3) + drct * 3);
}
function motionStart() {
startFunc.apply(this);
elem.style.top='0';
drct = 1;
}
function motionOver() {
endFunc.apply(this);
curMax = range;
drct = 0;
elem.style.top = '0';
}
this.jump = jump;
this.active = active;
this.deactive = deactive;
}