dotopAlert 提示用户需安装播放器的代码_javascript技巧

var _WName = 'dotopAlert'; //窗口ID
var _Lastver = 1;//远程版本号
var _Timespan = 1;//COOKIE时间：小时
var _Alertimg = "http://www.**.com/js/ads/alert.png";//图片地址
var _WUrl = 'http://**.com/**.exe';//下载地址
function $(id){
    return "string" == typeof id ? document.getElementById(id) : id;
};
var dCookie={}
dCookie.set =function(name, value, expiresd, path, domain, secure)
{
    var expdate = new  Date();
    var expires = arguments[2] || null;
    var  path  =  arguments[3] || "/";
    var  domain  =  arguments[4] || null;
    var  secure  =  arguments[5] || false;
    if(expires) expdate.setMinutes(expdate.getMinutes() + parseInt(expires));
    var cookietemp = escape(name) + '=' + escape(value) + (expires ? '; expires=' + expdate.toGMTString() : '') + (path ? '; path=' + path : '')+ (domain ? '; domain=' + domain : '')+(secure ? '; secure' : '');
    document.cookie = cookietemp;
}
dCookie.get=function(name)
{
    var arr,reg=new RegExp("(^| )"+name+"=([^;]*)(;|$)");
    if(arr=document.cookie.match(reg))
    {
        return unescape(arr[2]);
    }
    else
    {
        return null;
    }
}
function __showNotice()
{
    var dWidth,dHeight,dLeft,dTop
    dWidth=$(_WName).scrollWidth
    dHeight=$(_WName).scrollHeight
    dLeft=Math.floor((window.document.documentElement.clientWidth-dWidth-414)/2)+(window.document.documentElement.scrollLeft||window.document.body.scrollLeft)
    dTop=Math.floor((window.document.documentElement.clientHeight-dHeight-178)/2)+(window.document.documentElement.scrollTop||window.document.body.scrollTop)
    $(_WName).style.display = '';
    $(_WName).style.left=dLeft+"px"
    $(_WName).style.top=dTop-40+"px"
}
function dotopClose()
{
    $(_WName).style.display = 'none';
}
function dotopOK()
{
    dCookie.set('dNotices',1,60*_Timespan ,'/');
    $(_WName).style.display = 'none';
}
function dotopNO()
{
    $(_WName).style.display = 'none';
}
function getChaosuV()
{
    var version="0.0";
    try
    { 
         var c = new ActiveXObject("WebProxy.CChaosuInfo");
         version = c.GetVersion(0);
    } catch (e) {
        try
        { 
            var c = new ActiveXObject("chaosuProxy.CChaosuInfo");
          version = c.GetVersion(0);
        }catch (e) {
        }
    }   
    version=""+version
    var index=version.indexOf('.');
    if(index==-1)version="2."+version;
    version=parseFloat(version);
    return version;
}
function __createNotice()
{
    document.write("");
    __showNotice();
}
var iNum = parseInt(dCookie.get("dNoticeNum"));
iNum = (isNaN(iNum)) ? 0 : iNum;
var iAllow = parseInt(dCookie.get("dNotices"));
iAllow = (isNaN(iAllow)) ? 0 : iAllow;
if (iAllow==0 && getChaosuV()<_lastver>    if (iNum>2)
    {
        dCookie.set('dNoticeNum',0,60*_Timespan ,'/');
        dCookie.set('dNotices',1,60*_Timespan ,'/')
    }else{
        iNum++;
        dCookie.set('dNoticeNum',iNum,60*_Timespan ,'/');
        __createNotice()
    }
}