页面放大镜实现方法- 天山飞猫之家- 博客大巴
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    首先,说一下原理:

    放大镜效果的实现其实是通过overflow属性,在缩略图的旁边显示原图的某个区域。
    通过判定鼠标在缩略图中的位置,动态改变原图的margin值来实现移动放大镜的效果。

    其次,说明一下其实HTML标签是支持圆形的div的(IE6除外)
    IE6果然是阻碍HTML发展的巨大障碍啊~!

    {zh1},show一下自己写的代码:
    <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "">
    <html>
        <head>
            <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
            <title>fangdajing</title>
            <script type="text/javascript">
                var getCoordInDocumentExample = function(){
                    var coords = document.getElementById("bbb");
        coords.onmouseout=function(){document.getElementById("fadakuang").style.display="none";}
                    coords.onmousemove = function(e){
                        var pointer = getCoordInDocument(e);
                        var coord = document.getElementById("fada");
         var realX=100-pointer.x*1280/400;
         var realY=100-pointer.y*800/250;
         coord.style.margin=realY+" 0 0 "+realX;
         document.getElementById("fadakuang").style.display="block";
                    }
                }
                var getCoordInDocument = function(e){
                    e = e || window.event;
                    var x = e.pageX ||
                    (e.clientX +
                    (document.documentElement.scrollLeft ||
                    document.body.scrollLeft));
                    var y = e.pageY ||
                    (e.clientY +
                    (document.documentElement.scrollTop ||
                    document.body.scrollTop));
                    return {
                        'x': x,
                        'y': y
                    };
                }
                window.onload = function(){
                    getCoordInDocumentExample();
                };
            </script>
        </head>
        <body>
            <div id="bbb" style="width:400px;height:250px;float:left;">
                <img src="aaa.jpg" height="250px" width="400px" style="cursor:crosshair;">
            </div>
            <div id="detail" style="float:left;margin:20px;">
                <table>
                    <tr>
                        <td>
                            x=<span id="showX"></span>
                        </td>
                    </tr>
                    <tr>
                        <td>
                            y=<span id="showY"></span>
                        </td>
                    </tr>
                </table>
                <div id="fadakuang" style="width:200px;height:200px;overflow:hidden;display:none;">
                    <img id="fada" src="aaa.jpg" width="1280px" height="800px">
                </div>
            </div>
        </body>
    </html>

     





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