JS 实现页面弹窗

HTML代码

<input type="button" value="点击这里" onClick="sAlert();" />

JS代码

<script type="text/javascript" language="javascript">
		function sAlert(){
		var str="test弹窗效果trybb.com";
		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>