用层模拟对话框的两种效果代码（转）

代码一

<HTML><HEAD>
<META content="MSHTML 6.00.2800.1586" name=GENERATOR></HEAD>
<BODY><INPUT onclick="sAlert('测试效果<br/>还可以直接书写HTML代码 <br/>© 2006');" type=button value=点击这里>
<SCRIPT language=javascript type=text/javascript>
//Author:Daviv
//Blog:<a href="<a href="" target="_blank">http</a>" target="_blank"><a href="" target="_blank">http://</a></a>
//Date:2006-10-28

            function sAlert(str){
            var msgw,msgh,bordercolor;
            msgw=400;//提示窗口的宽度
            msgh=100;//提示窗口的高度
            bordercolor="#336699";//提示窗口的边框颜色
            titlecolor="#99CCFF";//提示窗口的标题颜色

            var sWidth,sHeight;
            sWidth=document.body.offsetWidth;
            sHeight=document.body.offsetHeight;

            var bgObj=document.createElement("div");
            bgObj.setAttribute('id','bgDiv');
            bgObj.style.position="absolute";
            bgObj.style.top="0";
            bgObj.style.background="#777";
            bgObj.style.filter="progid:DXImageTransform.Microsoft.Alpha(style=3,opacity=25,finishOpacity=75";
            bgObj.style.opacity="0.6";
            bgObj.style.left="0";
            bgObj.style.width=sWidth + "px";
            bgObj.style.height=sHeight + "px";
            document.body.appendChild(bgObj);
            var msgObj=document.createElement("div")
            msgObj.setAttribute("id","msgDiv");
            msgObj.setAttribute("align","center");
            msgObj.style.position="absolute";
            msgObj.style.background="white";
            msgObj.style.font="12px/1.6em Verdana, Geneva, Arial, Helvetica, sans-serif";
            msgObj.style.border="1px solid " + bordercolor;
            msgObj.style.width=msgw + "px";
            msgObj.style.height=msgh + "px";
          msgObj.style.top=(document.documentElement.scrollTop + (sHeight-msgh)/2) + "px";
          msgObj.style.left=(sWidth-msgw)/2 + "px";
          var title=document.createElement("h4");
          title.setAttribute("id","msgTitle");
          title.setAttribute("align","right");
          title.style.margin="0";
          title.style.padding="3px";
          title.style.background=bordercolor;
          title.style.filter="progid:DXImageTransform.Microsoft.Alpha(startX=20, startY=20, finishX=100, finishY=100,style=1,opacity=75,finishOpacity=100);";
          title.style.opacity="0.75";
          title.style.border="1px solid " + bordercolor;
          title.style.height="18px";
          title.style.font="12px Verdana, Geneva, Arial, Helvetica, sans-serif";
          title.style.color="white";
          title.style.cursor="pointer";
          title.innerHTML="关闭";
          title.onclick=function(){
            document.body.removeChild(bgObj);
        document.getElementById("msgDiv").removeChild(title);
        document.body.removeChild(msgObj);
        }
          document.body.appendChild(msgObj);
          document.getElementById("msgDiv").appendChild(title);
          var txt=document.createElement("p");
          txt.style.margin="1em 0"
          txt.setAttribute("id","msgTxt");
          txt.innerHTML=str;
      document.getElementById("msgDiv").appendChild(txt);
      }
        </SCRIPT>
</BODY></HTML>

代码二

<HTML><HEAD><TITLE>WWW.Seolm.Com 无为Tools</TITLE>
<META http-equiv=Content-Type content="text/html; charset=gb2312">
<META content="MSHTML 6.00.2800.1578" name=GENERATOR></HEAD>
<BODY>
<SCRIPT language=javascript>
// 隐藏被ID为objID的对象（层）遮挡的所有select
function HideOverSels(objID)
{
    var sels = document.getElementsByTagName('select');
    for (var i = 0; i < sels.length; i++)
      if (Obj1OverObj2(document.all[objID], sels[i]))
        sels[i].style.visibility = 'hidden';
          else
sels[i].style.visibility = 'visible';
}
//判断obj1是否遮挡了obj2
function Obj1OverObj2(obj1, obj2)
{
var pos1 = getPosition(obj1)
var pos2 = getPosition(obj2)
var result = true;
var obj1Left = pos1.left - window.document.body.scrollLeft;
var obj1Top = pos1.top - window.document.body.scrollTop;
var obj1Right = obj1Left + obj1.offsetWidth;
var obj1Bottom = obj1Top + obj1.offsetHeight;
var obj2Left = pos2.left - window.document.body.scrollLeft;
var obj2Top = pos2.top - window.document.body.scrollTop;
var obj2Right = obj2Left + obj2.offsetWidth;
var obj2Bottom = obj2Top + obj2.offsetHeight;

if (obj1Right <= obj2Left || obj1Bottom <= obj2Top ||
      obj1Left >= obj2Right || obj1Top >= obj2Bottom)
    result = false;
return result;
}
// 获取对象的坐标
function getPosition(Obj)
{
for (var sumTop=0,sumLeft=0;Obj!=window.document.body;sumTop+=Obj.offsetTop,sumLeft+=Obj.offsetLeft, Obj=Obj.offsetParent);
return {left:sumLeft,top:sumTop}
}
</SCRIPT>

<SCRIPT language=JavaScript>

</SCRIPT>
<SELECT name=""> <OPTION selected>test1</OPTION> <OPTION>test2</OPTION> <OPTION>test3</OPTION></SELECT>
<TABLE onmousemove="f_move(this);HideOverSels('t1')" onselectstart="return false" onmousedown=f_mdown(this) id=t1 style="LEFT: 50px; POSITION: absolute; TOP: 50px" width=200 border=1>
<TBODY>
<TR>
<TD style="CURSOR: move" align=middle bgColor=#cccccc>title1</TD></TR>
<TR>
<TD align=middle height=60>移到select上看看效果：）</TD></TR></TBODY></TABLE>
<TABLE onmousemove="f_move(this);HideOverSels('t2')" onselectstart="return false" onmousedown=f_mdown(this) id=t2 style="LEFT: 350px; POSITION: absolute; TOP: 250px" width=200 border=1>
<TBODY>
<TR>
<TD style="CURSOR: move" align=middle bgColor=#cccccc>title2</TD></TR>
<TR>
<TD align=middle height=60>content</TD></TR></TBODY></TABLE></BODY></HTML>