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先顯示大圖隨后自動(dòng)收起顯示小圖的JS廣告_綜合其它特效

這是一個(gè)非常不錯(cuò)的JavaScript圖片特效，當(dāng)最初打開網(wǎng)頁的時(shí)候，顯示的是大圖片，就像遮屏廣告一樣，停留一會(huì)后，自動(dòng)緩慢收起，這時(shí)由JS控制更換廣告圖片，始終顯示在網(wǎng)頁頂部，在一些大門戶網(wǎng)站我們經(jīng)常見到這種效果，個(gè)人感覺挺酷哦！

<!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>
<title>先顯示大圖隨后自動(dòng)收起顯示小圖的JS廣告 - www.ghpqjb.com</title>
<meta http-equiv="mrc-type" mrc="text/html;charset=gb2312">
<style type="text/css">
html,body{margin:0;text-align:center;font-size:12px;}
img{border:none}
p{margin:0px}
</style>
<script type="text/javascript">
var showAD = {
curve: function(t, b, c, d, s) {
if ((t /= d / 2) < 1) return c / 2 * t * t * t + b;
return c / 2 * ((t -= 2) * t * t + 2) + b
},

fx: function(from, to, playTime, onEnd) {
var Me = this,
who = this.adWrap,
position = 0,
changeVal = to - from,
curve = this.curve;
playTime = playTime / 10;
who.style.overflow = 'hidden';
function _run() {
if (position++<playTime) {
who.style.height = Math.max(1, Math.abs(Math.ceil(curve(position, from, changeVal, playTime)))) + "px";
setTimeout(_run, 10)
} else {
onEnd && onEnd.call(Me, to)
}
};
_run()
},
init: function(info) {
var Me = this,
loadImg = new Image;
loadImg.src = info.endImgURL;
window.onload=function() {
Me.endImgURL = info.endImgURL;
// More:www.ghpqjb.com/jscss/
Me.img = document.getElementById(info.imgID);
Me.adWrap = document.getElementById(info.adWrapID);
var max = Me.img.height;
setTimeout(function() {
Me.fx(max, 0, 500,
function(x) {
this.img.src = this.endImgURL;
this.curve = function(t, b, c, d) {
if ((t /= d) < (1 / 2.75)) {
return c * (7.5625 * t * t) + b
} else if (t < (2 / 2.75)) {
return c * (7.5625 * (t -= (1.5 / 2.75)) * t + .75) + b
} else if (t < (2.5 / 2.75)) {
return c * (7.5625 * (t -= (2.25 / 2.75)) * t + .9375) + b
} else {
return c * (7.5625 * (t -= (2.625 / 2.75)) * t + .984375) + b
}
};
this.fx(0, this.img.height,600)
})
},
info.timeout || 1000)
};
}
};
showAD.init({
adWrapID: 'ad_box_2009_06',
imgID: 'adImg',
endImgURL: 'jscss/demoimg/200906/as.jpg'
});
</script>
</head>
<body>
<div id="ad_box_2009_06"><img src="jscss/demoimg/200906/ab.jpg" id="adImg"></div>
</body>
</html>

所屬頻道：綜合其它特效/更新時(shí)間：2013-06-16

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