点击页面上的按纽，弹出一个层，背景变灰

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Microsoft XHTML HTML 浏览器

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">

<head>

<title></title>
<script>
	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 = "#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;//浏览器工作区域内页面宽度 

		sHeight = screen.height;//屏幕高度（垂直分辨率） 

		//背景层（大小与窗口有效区域相同，即当弹出对话框时，背景显示为放射状透明灰色） 

		var bgObj = document.createElement("div ");//创建一个div对象（背景层） 

		//定义div属性，即相当于 

		// <div   id= "msgDiv "   align= "center "   style= "background-color:white;   border:1px   solid   #336699;   position:absolute;   left:50%;   top:50%;   font:12px/1.6em   Verdana,Geneva,Arial,Helvetica,sans-serif;   margin-left:-225px;   margin-top:npx;   width:400px;   height:100px;   text-align:center;   line-height:25px;   z-index:100001; "> __tag_35$351_

		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";

		bgObj.style.zIndex = "10000";

		document.body.appendChild(bgObj);//在body内添加该div对象 

		var msgObj = document.createElement("div")//创建一个div对象（提示框层） 

		//定义div属性，即相当于 

		// <div   id= "msgDiv "   align= "center "   style= "background-color:white;   border:1px   solid   #336699;   position:absolute;   left:50%;   top:50%;   font:12px/1.6em   Verdana,Geneva,Arial,Helvetica,sans-serif;   margin-left:-225px;   margin-top:npx;   width:400px;   height:100px;   text-align:center;   line-height:25px;   z-index:100001; "> __tag_72$353_ 

		msgObj.setAttribute("id", "msgDiv");

		msgObj.setAttribute("align", "center");

		msgObj.style.background = "white ";

		msgObj.style.border = "1px solid ";

		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");//创建一个h4对象（提示框标题栏） 

		//定义h4的属性，即相当于 

		// <h4   id= "msgTitle "   align= "right "   style= "margin:0;   padding:3px;   background-color:#336699;   filter:progid:DXImageTransform.Microsoft.Alpha(startX=20,   startY=20,   finishX=100,   finishY=100,style=1,opacity=75,finishOpacity=100);   opacity:0.75;   border:1px   solid   #336699;   height:18px;   font:12px   Verdana,Geneva,Arial,Helvetica,sans-serif;   color:white;   cursor:pointer; "   onclick= " "> 关闭 __tag_110$425_ 

		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";

		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 = removeObj;

		var button = document.createElement("input");//创建一个input对象（提示框按钮） 

		//定义input的属性，即相当于 

		// __tag_146$7_ 

		button.setAttribute("type", "button");

		button.setAttribute("value", "关闭");

		button.style.width = "60px";

		button.style.align = "center";

		button.style.marginLeft = "250px";

		button.style.marginBottom = "10px";

		button.style.background = bordercolor;

		button.style.border = "1px   solid";

		button.style.color = "white";

		button.onclick = removeObj;

		function removeObj()

		{//点击标题栏触发的事件 

			document.body.removeChild(bgObj);//删除背景层Div 

			document.getElementById("msgDiv").removeChild(title);//删除提示框的标题栏 

			document.body.removeChild(msgObj);//删除提示框层 

		}

		document.body.appendChild(msgObj);//在body内添加提示框div对象msgObj 

		document.getElementById("msgDiv").appendChild(title);//在提示框div中添加标题栏对象title 

		var txt = document.createElement("p");//创建一个p对象（提示框提示信息） 

		//定义p的属性，即相当于 

		// __tag_192$7_ 测试效果 __tag_192$60_ 

		txt.style.margin = "1em   0"

		txt.setAttribute("id ", "msgTxt");

		txt.innerHTML = str;//来源于函数调用时的参数值 

		document.getElementById("msgDiv").appendChild(txt);//在提示框div中添加提示信息对象txt 

		document.getElementById("msgDiv").appendChild(button);//在提示框div中添加按钮对象button
</script>

<meta http-equiv="Content-Type " content="text/html;   charset=utf8 " />
</head>

<body>
<p>测试弹出框</p>
<input type="button" onclick=" sAlert( '测试效果 <br/> 嗯！效果还不错！ '); " value="点击这里 " />
</body>

</html>

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