JS + DIV ===> 精美alert提示框-优快云博客

本文链接：https://blog.youkuaiyun.com/iteye_16325/article/details/81654241
本文提供了一个使用JavaScript实现自定义弹窗效果的例子，包括可拖动提示框和兼容不同浏览器的提示框。通过创建DOM元素并设置样式，实现了平滑过渡效果及鼠标拖动功能。
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如果*.js出现乱码现象,可以把该*.js文件用记事本打开,然后另存为UTF-8格式的*.js文件即可.
<html>
<head>
<title></title>
<script type="text/javascript" >
<!--
function inpFun()
{
    var obje=function(){};
    obje.names='arguments from hosting.';
    var rtnVal=window.showModalDialog("a.htm",obje,"help=no;status=no;resizable=yes;scroll=no;center=yes;edge=sunken");
    alert(rtnVal);
}
-->
</script>
<script type="text/javascript" language="javascript">
<!--
function dragAB()
{
    alert("你可以拖动我吗？")
}
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 = "100%";
    shield.style.background = "#6600cc";
    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.right = "50%";
    alertFram.style.bottom = "50%";
    alertFram.style.marginRight = "-125px";
    alertFram.style.marginBottom = "-75px";
   
    alertFram.style.width = "250px";
    alertFram.style.height = "150px";
    alertFram.style.background = "#000";
    alertFram.style.textAlign = "center";
    alertFram.style.lineHeight = "150px";
    alertFram.style.zIndex = "10002";
    strHtml = "<ul style=\"list-style:none;margin:0px;padding:0px;width:100%\">\n";
    strHtml += "<li οnmοusedοwn=\"oMove(parentNode.parentNode);\" title=\"可移动提示框\" style=\"cursor:move;background:#002F9C;text-align:left;padding-left:5px;font-size:14px;font-weight:bold;color: #FFFFFF;height:25px;line-height:25px;border-left:1px solid #FFFFFF;border-top:1px solid #FFFFFF;border-right:1px solid #FFFFFF;\">可移动提示框</li>\n";
    strHtml += "<li style=\"background:#5A7EDC;text-align:center;font-size:12px;color: #FFFFFF;height:120px;line-height:120px;border-left:1px solid #FFFFFF;border-right:1px solid #FFFFFF;\">"+txt+"</li>\n";
    strHtml += "<li style=\"background:#002F9C;text-align:center;font-weight:bold;height:25px;line-height:25px; border-left:1px solid #FFFFFF;border-bottom:1px solid #FFFFFF;border-right:1px solid #FFFFFF;\"><input type=button value=' 确定 ' οnclick=\"remove()\"></li>\n";
    strHtml += "</ul>\n";
    alertFram.innerHTML = strHtml;
    document.body.appendChild(alertFram);
    document.body.appendChild(shield);
    var c = 0;
    this.doAlpha = function()
    {
        if (c++ > 50){clearInterval(ad);return 0;}
        shield.style.filter = "alpha(opacity="+c+");";
    }
    this.remove=function()
    {
       shield.style.filter = "";
       shield.id = "";
       shield.style.position = "";
       shield.style.left = "";
       shield.style.top = "";
       shield.style.width = "";
       shield.style.height ="";
       shield.style.background = "";
       shield.style.textAlign = "";
       shield.style.zIndex = "";
       shield.style.filter = "";
       alertFram.innerHTML="";
       alertFram.id="";
       alertFram.style.position = "";
       alertFram.style.left = "";
       alertFram.style.top = "";
       alertFram.style.marginLeft = "";
       alertFram.style.marginTop = "";
       alertFram.style.width = "";
       alertFram.style.height = "";
       alertFram.style.background = "";
       alertFram.style.textAlign = "";
       alertFram.style.lineHeight = "";
       alertFram.style.zIndex = "";
    }
   
    var ad = setInterval("doAlpha()",10);
    alertFram.focus();
    document.body.onselectstart = function(){return false;};
}
function oMove(obj)
{
    var otop,oleft;
    tag_1=true;
    otop = event.y - obj.offsetTop;
    oleft = event.x - obj.offsetLeft;
    obj.setCapture();
    obj.onmousemove = function()
    {
        if(tag_1)
        {
           obj.style.left = event.x - oleft;
           obj.style.top = event.y - otop;
        }
    }
    obj.onmouseup = function()
    {
       obj.onmouseup = null;
       obj.style.filter = null;
       tag_1=false;
       obj.releaseCapture();
    }
}
//-->
</script>
<script type="text/javascript" language="javascript">
<!--
//兼容IE,firefox                
function sAlert(txt)
{
    var eSrc=(document.all)?window.event.srcElement:arguments[1];
    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 = "100%"//document.body.scrollHeight+"px";
    shield.style.background = "#cc0066";
    shield.style.textAlign = "center";
    shield.style.zIndex = "770";
    shield.style.filter = "alpha(opacity=0)";
    shield.style.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 = -75+document.documentElement.scrollTop+"px";
    alertFram.style.width = "450px";
    alertFram.style.height = "150px";
    alertFram.style.background = "#ccc";
    alertFram.style.textAlign = "center";
    alertFram.style.lineHeight = "150px";
    alertFram.style.zIndex = "777";
    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;\">Browser兼容提示框</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\" id=\"do_OK\" οnclick=\"doOk();\"/></li>\n";
    strHtml += "</ul>\n";
    alertFram.innerHTML = strHtml;
    document.body.appendChild(alertFram);
    document.body.appendChild(shield);
    this.setOpacity = function(obj,opacity)
    {
        if(opacity>=1)opacity=opacity/100;
        try
        {
            obj.style.opacity=opacity;
        }
        catch(e)
        {}
        try
        {
            if(obj.filters.length>0&&obj.filters("alpha"))
            {
                obj.filters("alpha").opacity=opacity*100;
            }
            else
            {
                obj.style.filter="alpha(opacity=\""+(opacity*100)+"\")";
            }
        }
        catch(e)
        {}
    }
    var c = 0;
    this.doAlpha = function()
    {
        if (++c > 20)
        {
            clearInterval(ad);
            return 0;
        }
        setOpacity(shield,c);
    }
    var ad = setInterval("doAlpha()",1);
    this.doOk = function()
    {
        //alertFram.style.display = "none";
        //shield.style.display = "none";
        document.body.removeChild(alertFram);
        document.body.removeChild(shield);
        eSrc.focus();
        document.body.onselectstart = function(){return true;}
        document.body.oncontextmenu = function(){return true;}
    }
    document.getElementById("do_OK").focus();
    eSrc.blur();
    document.body.onselectstart = function(){return false;}
    document.body.oncontextmenu = function(){return false;}
}
-->
</script>
</head>
<body>
<p>
<input type="button" name="cry" value="运行可拖动提示框" οnclick="dragAB();"/>
</p>
<p>
<input type="button" name="btn_1" value="兼容IE,firefox提示框" οnclick="sAlert('兼容IE,firefox')" />
</p>
</body>
</html>