js 修改alert 样式 -

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js 修改alert 样式

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java script

js改变 alert 样式。

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
     "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
    <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="gb2312" >
    <head>
     <meta http-equiv="content-type" content="text/html; charset=gb2312" />
     <meta name="author" content="Smiling Dolphin" />
     <meta name="keywords" content="design, css, cascading, style, sheets, xhtml, graphic design, w3c, web standards, visual, display, java, javascript, c++, php, jsp, asp, py, pl" />
     <meta name="description" content="my favorites language." />
     <meta name="robots" content="all" />
     <title>Dolphin Document</title>
     <style type="text/css" title="currentStyle" media="screen">
         body,p{
             margin:0px;
             padding:0px;
         }
     </style>
    </head>
    <body>
    <input type="button" value="显示Alert" onclick="alert('我改写了Alert显示的样式')" />
    <textarea>这里显示文章</textarea>
    <p>abc</p>
    <p>abc</p>
    <p>abc</p>
    <p>abc</p>
    <p>abc</p>
    <p>abc</p>
    <p>abc</p>
    <p>abc</p>
    <p>abc</p>
    <p>abc</p>
    <p>abc</p>
    <p>abc</p>
    <p>abc</p>
    <p>abc</p>
    <p>abc</p>
    <p>abc</p>
    <p>abc</p>
    <p>abc</p>
    <p>abc</p>
    <p>abc</p>
    <p>abc</p>
    <p>abc</p>
    <p>abc</p>
    <p>abc</p>
    <p>abc</p>
    <p>abc</p>
    <p>abc</p>
    <p>abc</p>
    <p>abc</p>
    <p>abc</p>
    <p>abc</p>
    <p>abc</p>
    <p>abc</p>
    <p>abc</p>
    <p>abc</p>
    <p>abc</p>
    <p>abc</p>
    <p>abc</p>
    <p>abc</p>
    <p>abc</p>
    <p>abc</p>
    <p>abc</p>
    <p>abc</p>
    <p>abc</p>
    <p>abc</p>
    <p>abc</p>
    <p>abc</p>
    <p>abc</p>
    <script language="javascript" type="text/javascript">
    window.alert = function(txt)
    {
     var shield = document.createElement("DIV");
     shield.id = "shield";
     shield.style.position = "absolute";
     shield.style.left = "0px";
     shield.style.top = "0px";
     shield.style.width = "100%";
     shield.style.height = document.body.scrollHeight+"px";
     shield.style.background = "#333";
     shield.style.textAlign = "center";
     shield.style.zIndex = "10000";
     shield.style.filter = "alpha(opacity=0)";
     var alertFram = document.createElement("DIV");
     alertFram.id="alertFram";
     alertFram.style.position = "absolute";
     alertFram.style.left = "50%";
     alertFram.style.top = "50%";
     alertFram.style.marginLeft = "-225px";
     alertFram.style.marginTop = "-75px";
     alertFram.style.width = "450px";
     alertFram.style.height = "150px";
     alertFram.style.background = "#ccc";
     alertFram.style.textAlign = "center";
     alertFram.style.lineHeight = "150px";
     alertFram.style.zIndex = "10001";
     strHtml = "<ul style=\"list-style:none;margin:0px;padding:0px;width:100%\">\n";
     strHtml += " <li style=\"background:#DD828D;text-align:left;padding-left:20px;font-size:14px;font-weight:bold;height:25px;line-height:25px;border:1px solid #F9CADE;\">[系统提示]</li>\n";
     strHtml += " <li style=\"background:#fff;text-align:center;font-size:12px;height:120px;line-height:120px;border-left:1px solid #F9CADE;border-right:1px solid #F9CADE;\">"+txt+"</li>\n";
     strHtml += " <li style=\"background:#FDEEF4;text-align:center;font-weight:bold;height:25px;line-height:25px; border:1px solid #F9CADE;\"><input type=\"button\" value=\"确 定\" onclick=\"doOk()\" /></li>\n";
     strHtml += "</ul>\n";
     alertFram.innerHTML = strHtml;
     document.body.appendChild(alertFram);
     document.body.appendChild(shield);
     var c = 0;
     this.doAlpha = function(){
         if (c++ > 20){clearInterval(ad);return 0;}
         shield.style.filter = "alpha(opacity="+c+");";
     }
     var ad = setInterval("doAlpha()",5);
     this.doOk = function(){
         alertFram.style.display = "none";
         shield.style.display = "none";
     }
     alertFram.focus();
     document.body.onselectstart = function(){return false;};
    }
    </script>
    </body>
    </html>

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