javascript代码实现 随机漂浮的广告图片 代码实例

<!DOCTYPE html>
<html>
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
        <title>js随机飘动的广告图片代码</title>
    </head>
    <body> 
       <div id="main" style="position:absolute;">
            <div style="text-align:right;cursor:pointer;" id="close">关闭</div>
            <a href="" target="_blank"><img src="图片地址.jpg" border="0" width="214" height="73" /></a>
        </div>
    </body>
</html>
<script src="http://libs.baidu.com/jquery/1.11.3/jquery.min.js"></script>
<script>
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    function addEvent(obj, evtType, func, cap) {
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            windowHeight = self.innerHeight;
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            windowWidth = document.documentElement.clientWidth;
            windowHeight = document.documentElement.clientHeight;
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            windowWidth = document.body.clientWidth;
            windowHeight = document.body.clientHeight;
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        if (yScroll < windowHeight) {
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        arrayPageSize = new Array(pageWidth, pageHeight, windowWidth, windowHeight)
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    var AdMoveConfig = new Object();
    AdMoveConfig.IsInitialized = false;
    AdMoveConfig.AdCount = 0;
    AdMoveConfig.ScrollX = 0;
    AdMoveConfig.ScrollY = 0;
    AdMoveConfig.MoveWidth = 0;
    AdMoveConfig.MoveHeight = 0;
    AdMoveConfig.Resize = function () {
        var winsize = GetPageSize();
        AdMoveConfig.MoveWidth = winsize[2];
        AdMoveConfig.MoveHeight = winsize[3];
        AdMoveConfig.Scroll();
    }
    AdMoveConfig.Scroll = function () {
        var winscroll = getPageScroll();
        AdMoveConfig.ScrollX = winscroll[0];
        AdMoveConfig.ScrollY = winscroll[1];
    }
    addEvent(window, "resize", AdMoveConfig.Resize);
    addEvent(window, "scroll", AdMoveConfig.Scroll);
    function AdMove(id, addCloseButton) {
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            AdMoveConfig.Resize();
            AdMoveConfig.IsInitialized = true;
        }
        AdMoveConfig.AdCount++;
        var obj = document.getElementById(id);
        obj.style.position = "absolute";
        var W = AdMoveConfig.MoveWidth - obj.offsetWidth;
        var H = AdMoveConfig.MoveHeight - obj.offsetHeight;
        var x = W * Math.random(), y = H * Math.random();
        var rad = (Math.random() + 1) * Math.PI / 6;
        var kx = Math.sin(rad), ky = Math.cos(rad);
        var dirx = (Math.random() < 0.5 ? 1 : -1), diry = (Math.random() < 0.5 ? 1 : -1);
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        var interval;
        if (addCloseButton) {
            var closebtn = document.createElement("div");
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            closebtn.onclick = function () {
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                clearInterval(interval);
                closebtn.onclick = null;
                obj.onmouseover = null;
                obj.onmouseout = null;
                obj.MoveHandler = null;
                AdMoveConfig.AdCount--;
                if (AdMoveConfig.AdCount <= 0) {
                    removeEvent(window, "resize", AdMoveConfig.Resize);
                    removeEvent(window, "scroll", AdMoveConfig.Scroll);
                    AdMoveConfig.Resize = null;
                    AdMoveConfig.Scroll = null;
                    AdMoveConfig = null;
                }
            }
        }
        obj.MoveHandler = function () {
            obj.style.left = (x + AdMoveConfig.ScrollX) + "px";
            obj.style.top = (y + AdMoveConfig.ScrollY) + "px";
            rad = (Math.random() + 1) * Math.PI / 6;
            W = AdMoveConfig.MoveWidth - obj.offsetWidth;
            H = AdMoveConfig.MoveHeight - obj.offsetHeight;
            x = x + step * kx * dirx;
            if (x < 0) { dirx = 1; x = 0; kx = Math.sin(rad); ky = Math.cos(rad); }
            if (x > W) { dirx = -1; x = W; kx = Math.sin(rad); ky = Math.cos(rad); }
            y = y + step * ky * diry;
            if (y < 0) { diry = 1; y = 0; kx = Math.sin(rad); ky = Math.cos(rad); }
            if (y > H) { diry = -1; y = H; kx = Math.sin(rad); ky = Math.cos(rad); }
        }
        this.SetLocation = function (vx, vy) { x = vx; y = vy; }
        this.SetDirection = function (vx, vy) { dirx = vx; diry = vy; }
        this.Run = function () {
            var delay = 10;
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            obj.onmouseover = function () { clearInterval(interval); }
            obj.onmouseout = function () { interval = setInterval(obj.MoveHandler, delay); }
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    }
    //-->
</script>
<script type="text/javascript">
    $(function() {
        $("#close").click(function() {
            $("#main").hide();
        });
    })
    var ad1 = new AdMove("main", true);
    ad1.Run();
</script>

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