兼容IE与Firefox透明DIV提示框

关注+2008-10-31作者：

<html>
<head>
<style>
body{}{
margin:0px;
}
</style>
<title></title>
<script>
function DivAlert(messageDiv){
this.messageDIV=messageDiv;
//创建提示框底层
    this.bottomDIV = document.createElement("div");
//获取body中间点
    var x=document.body.clientWidth/2,y=document.body.clientHeight/2;
//配置样式
    this.bottomDIV.style.opacity="0.50";
this.bottomDIV.style.filter="Alpha(opacity=50);";
this.bottomDIV.style.backgroundColor="#CCCCCC";
this.bottomDIV.style.height=document.body.scrollHeight+"px";
this.bottomDIV.style.width="100%";
this.bottomDIV.style.marginTop="0px";
this.bottomDIV.style.marginLeft="0px";
this.bottomDIV.style.position="absolute";
this.bottomDIV.style.top="0px";
this.bottomDIV.style.left="0px";
this.bottomDIV.style.zIndex=100;
//显示提示框
    this.show = function(){
//显示提示框底层
          document.body.appendChild(this.bottomDIV);
//显示messageDIV
        document.body.appendChild(this.messageDIV);
//把messageDIV定位到body中间
        this.messageDIV.style.position="absolute";
x=x-this.messageDIV.clientWidth/2;
y=y-this.messageDIV.clientHeight/2;
this.messageDIV.style.top=y+"px";
this.messageDIV.style.left=x+"px";
this.messageDIV.style.zIndex=101;
}
//移除提示框
      this.remove = function(){
document.body.removeChild(this.bottomDIV);
document.body.removeChild(this.messageDIV);
}
}
//测试DivAlert对象
var dc;
function test(){
//创建提示框内容部分
     var d = document.createElement("div");
d.style.width="220px";
d.style.height="150px";
d.style.backgroundColor="#AA00CC";
d.style.padding="10px";
//向提示框内容部分画需要显示的信息
     d.innerHTML="Hello World<br/><input type="button" style="color:#cc4044" value="close this DivAlert" onclick="test2()"/>"
//实例化提示框
     dc = new DivAlert(d);
//显示提示框
     dc.show();
}
//提示框里的Button按钮点击事件
function test2(){
//移除对话框
    dc.remove();
}
</script>
</head>
<body>
<a href="javascript:void(0)" onClick="test();">click</a>
</body>
</html>