求帮忙写一个html或者js代码，实现访问网站弹出一个提示框，只提示一次！ 跟图片一样的提示。 html5如何实现弹出提示框，并且伴随遮罩层并且可以关闭弹出...

\u6c42\u5e2e\u5fd9\u5199\u4e00\u4e2ahtml\u6216\u8005js\u4ee3\u7801\uff0c\u5b9e\u73b0\u8bbf\u95ee\u7f51\u7ad9\u68c0\u6d4b\u8bbf\u95ee\u5730\u533a\uff0c\u5f53\u5730\u533a\u4e0d\u662f\u4e00\u5b9a\u5730\u533a\u65f6\u5f39\u51fa\u4e00\u4e2a\u63d0\u793a\uff01

var ipinfo = localAddress["province"] + localAddress["city"];
if (
ipinfo.toString().indexOf("\u5317\u4eac") != -1 ||
ipinfo.toString().indexOf("\u4e0a\u6d77") != -1 || ipinfo.toString().indexOf("\u5e7f\u5dde") != -1 || ipinfo.toString().indexOf("\u6df1\u5733")!= -1 || ipinfo.toString().indexOf("\u957f\u6625")!= -1 ) {
alert(ipinfo)
} else {
alert("\u4e0d\u5728\u4e0a\u9762\u5224\u65ad\u5730\u533a")
}

\u901a\u8fc7jquery\u7684show()\u548chide()\u51fd\u6570\u8054\u5408\u4f7f\u7528\uff0c\u5b9e\u73b0\u5f39\u51fa\u7a97\u53e3\u3002
\u4e00\u3001show\uff08\uff09\u548chide\uff08\uff09\u51fd\u6570\u89e3\u6790\uff1a
1\u3001show() \u65b9\u6cd5\u663e\u793a\u9690\u85cf\u7684\u88ab\u9009\u5143\u7d20\u3002
\u6ce8\u610f\uff1ashow() \u9002\u7528\u4e8e\u901a\u8fc7 jQuery \u65b9\u6cd5\u548c CSS \u4e2d display:none \u9690\u85cf\u7684\u5143\u7d20\uff08\u4e0d\u9002\u7528\u4e8e\u901a\u8fc7 visibility:hidden \u9690\u85cf\u7684\u5143\u7d20\uff09\u3002
2\u3001hide() \u65b9\u6cd5\u9690\u85cf\u88ab\u9009\u5143\u7d20\u3002
\u8fd9\u4e0e CSS \u5c5e\u6027 display:none \u7c7b\u4f3c\uff0c\u4f46\u662f\u9690\u85cf\u7684\u5143\u7d20\u4e0d\u4f1a\u88ab\u5b8c\u5168\u663e\u793a\uff08\u4e0d\u518d\u5f71\u54cd\u9875\u9762\u7684\u5e03\u5c40\uff09\u3002
\u4e8c\u3001\u8bbe\u8ba1\u4e00\u4e2aHTML\u9875\u9762\uff0c\u5305\u62ec\u4e00\u4e2a\u7b80\u5355\u7684\u5f39\u51fa\u7a97\uff0c\u548c\u4e00\u4e2a\u663e\u793a\u6309\u94ae\u3002\u5176\u4e2d\uff0c\u8c03\u7528\u4e86jquery\u7684\u4ee5\u4e0a\u4e24\u4e2a\u51fd\u6570\u3002\u5177\u4f53\u4ee3\u7801\u5982\u4e0b\uff1a

\u4e09\u3001\u8bbe\u8ba1\u906e\u7f69\u5c42\u7684\u6837\u5f0f\uff0c\u5982\u4e0b\uff1a

\u56db\u3001\u5f39\u51fa\u7a97\u53e3\u7684css\u6837\u5f0f\uff0c\u4ee3\u7801\u5982\u4e0b\uff1a

\u4e94\u3001\u521d\u59cb\u9875\u9762\u5982\u4e0b\uff1a

\u516d\u3001\u70b9\u51fb\u6309\u94ae\uff0c\u67e5\u770b\u5f39\u51fa\u7a97\u53e3\u7ed3\u679c\uff1a

\u4e03\u3001\u5173\u95ed\u5f39\u51fa\u7a97\u540e\uff0c\u6253\u5f00\u5f00\u53d1\u8005\u4e2d\u5fc3\uff0c\u5982\u4e0b\uff1a

=======测试可运行，里面具体内容自己添加

<input type="button" value="点击这里" onclick="sAlert('测试效果<br>还可以直接书写HTML代码 <br>&#169; 2006');" />

<script type="text/javascript" language="javascript">
            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
            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.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>

在DW里面行为可以实现

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