用js模拟一个类是于Windows中的模态窗口！

<script type="text/javascript" language="javascript">
//more javascript from http://www.smallrain.net
  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
  titleheight=25 //提示窗口标题高度
  bordercolor="#c51100";//提示窗口的边框颜色
  titlecolor="#c51100";//提示窗口的标题颜色
  
  var sWidth,sHeight;
  sWidth=screen.width;
  sHeight=screen.height;

  var bgObj=document.createElement("div");
  bgObj.setAttribute('id','bgDiv');
  bgObj.style.position="absolute";
  bgObj.style.top="0";
  bgObj.style.background="#cccccc";
  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";
  bgObj.style.zIndex = "10000";
  document.body.appendChild(bgObj);
  
  var msgObj=document.createElement("div")
  msgObj.setAttribute("id","msgDiv");
  msgObj.setAttribute("align","center");
  msgObj.style.background="white";
  msgObj.style.border="1px solid " + bordercolor;
  msgObj.style.position = "absolute";
  msgObj.style.left = "50%";
  msgObj.style.top = "50%";
  msgObj.style.font="12px/1.6em Verdana, Geneva, Arial, Helvetica, sans-serif";
  msgObj.style.marginLeft = "-225px" ;
  msgObj.style.marginTop = -75+document.documentElement.scrollTop+"px";
  msgObj.style.width = msgw + "px";
  msgObj.style.height =msgh + "px";
  msgObj.style.textAlign = "center";
  msgObj.style.lineHeight ="25px";
  msgObj.style.zIndex = "10001";

    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>

 

调用方法：
<input type="button" value="点击这里" onclick="sAlert('test弹窗效果');" />