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模拟弹出窗口效果，关闭层之前，不能选择后面的页内容

2019-11-21 02:17:33

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

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