PPK提供的浏览器类型及版本检测方法

Browser name: BrowserDetect.browser 
Browser version: BrowserDetect.version 
OS name: BrowserDetect.OS 

var  BrowserDetect  =  {
    init:  function  () {
         this .browser  =   this .searchString( this .dataBrowser)  ||   " An unknown browser " ;
         this .version  =   this .searchVersion(navigator.userAgent)
             ||   this .searchVersion(navigator.appVersion)
             ||   " an unknown version " ;
         this .OS  =   this .searchString( this .dataOS)  ||   " an unknown OS " ;
    },
    searchString:  function  (data) {
         for  ( var  i = 0 ;i < data.length;i ++ )    {
             var  dataString  =  data[i].string;
             var  dataProp  =  data[i].prop;
             this .versionSearchString  =  data[i].versionSearch  ||  data[i].identity;
             if  (dataString) {
                 if  (dataString.indexOf(data[i].subString)  !=   - 1 )
                     return  data[i].identity;
            }
             else   if  (dataProp)
                 return  data[i].identity;
        }
    },
    searchVersion:  function  (dataString) {
         var  index  =  dataString.indexOf( this .versionSearchString);
         if  (index  ==   - 1 )  return ;
         return  parseFloat(dataString.substring(index + this .versionSearchString.length + 1 ));
    },
    dataBrowser: [
        {
            string: navigator.userAgent,
            subString:  " Chrome " ,
            identity:  " Chrome "
        },
        {     string: navigator.userAgent,
            subString:  " OmniWeb " ,
            versionSearch:  " OmniWeb/ " ,
            identity:  " OmniWeb "
        },
        {
            string: navigator.vendor,
            subString:  " Apple " ,
            identity:  " Safari " ,
            versionSearch:  " Version "
        },
        {
            prop: window.opera,
            identity:  " Opera "
        },
        {
            string: navigator.vendor,
            subString:  " iCab " ,
            identity:  " iCab "
        },
        {
            string: navigator.vendor,
            subString:  " KDE " ,
            identity:  " Konqueror "
        },
        {
            string: navigator.userAgent,
            subString:  " Firefox " ,
            identity:  " Firefox "
        },
        {
            string: navigator.vendor,
            subString:  " Camino " ,
            identity:  " Camino "
        },
        {         //  for newer Netscapes (6+)
            string: navigator.userAgent,
            subString:  " Netscape " ,
            identity:  " Netscape "
        },
        {
            string: navigator.userAgent,
            subString:  " MSIE " ,
            identity:  " Explorer " ,
            versionSearch:  " MSIE "
        },
        {
            string: navigator.userAgent,
            subString:  " Gecko " ,
            identity:  " Mozilla " ,
            versionSearch:  " rv "
        },
        {          //  for older Netscapes (4-)
            string: navigator.userAgent,
            subString:  " Mozilla " ,
            identity:  " Netscape " ,
            versionSearch:  " Mozilla "
        }
    ],
    dataOS : [
        {
            string: navigator.platform,
            subString:  " Win " ,
            identity:  " Windows "
        },
        {
            string: navigator.platform,
            subString:  " Mac " ,
            identity:  " Mac "
        },
        {
               string: navigator.userAgent,
               subString:  " iPhone " ,
               identity:  " iPhone/iPod "
        },
        {
            string: navigator.platform,
            subString:  " Linux " ,
            identity:  " Linux "
        }
    ]

};
BrowserDetect.init();