javascript伸缩广告代码-Javascript-技术教程-asp编程网

效果：打开页面时，出现一个大幅广告，过一段时间后，大幅广告缩小成一个小幅广告，宽度不变，高度变小，并且带有缩小动画。点击运行可看到效果。
[code]
<!DOCTYPE HTML PUBLIC"-//W3C//DTD HTML 4.0 Transitional//EN">
<html>
    <head>
        <style>
            html,body{margin:0;font-size:12px}img{border:none}p{border-top:5px solid#660000;padding:40px;background:#999900;height:1500px;margin:0px}
        </style>
        <script>
            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;
                        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_04',
                imgID: 'adImg',
                endImgURL: 'http://www.aspprogram.cn/test/a.jpg'
            });
        </script>
    <meta http-equiv="Content-Type" content="text/html; charset=gb2312"></head>

    <body>
        <div id="ad_box_2009_04" style="background:BF0008">
            <img src="http://www.aspprogram.cn/test/b.jpg" id="adImg" />
        </div>
        <p>正文</p>
    </body>
</html>
[/code]

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