关于窗口特效的JS代码

解决方案 »

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设置overflow就行了，
如下：<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<title>banner</title>
<style type="text/css">

</style></head><body>
 
</body>
<script type="text/javascript" language="javascript">
 function sAlert(str){
var oflow=document.body.style.overflow;//这里将滚动条状态保存，关闭时恢复
 document.body.style.overflow="hidden";//隐藏滚动条
 var msgw,msgh,bordercolor;
 msgw=525;//提示窗口的宽度
 msgh=375;//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.style.overflow=oflow;
 }
 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);
 }
 sAlert("哈哈");
</script>
</html>
结帖给分，
设置document.body.scroollTop就行了,
下面的是代码，（已在IE8,Firefox3.5,Chrome2.0,Opeara9.64,Safari4.0.3下测试通过）<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<title>banner</title>
<style type="text/css">

</style></head><body>
1 2 3 9 <input type="button" value="测试" id="btn1"/> 5 6 
</body>
<script type="text/javascript" language="javascript">
 function sAlert(str){
 var oflow=document.body.style.overflow;//这里将滚动条状态保存，关闭时恢复
 document.body.style.overflow="hidden";//隐藏滚动条
 var msgw,msgh,bordercolor;
 msgw=525;//提示窗口的宽度
 msgh=375;//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.top=document.body.scrollTop+"px";//这里
 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";
 sHeight="Netscape"==navigator.appName?window.screen.availHeight:sHeight;//这里为了兼容Firefox,Chrome,Safari
 msgObj.style.top=(document.body.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.style.overflow=oflow;
 }
 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);
 }
 document.getElementById("btn1").onclick=function() {
sAlert("哈哈");
 }
</script>
</html>