JS擷取用戶端資訊(螢幕分辨率、浏覽器版本、作業系統版本)

廢話就不多說了，直接上JS代碼，如下：

/**
 * 擷取浏覽器版本
 * @returns
 */
function getBrowserInfo(){
	var agent = navigator.userAgent.toLowerCase() ;
	var regStr_ie = /msie [\d.]+;/gi;
	var regStr_ff = /firefox\/[\d.]+/gi;
	var regStr_chrome = /chrome\/[\d.]+/gi;
	var regStr_saf = /safari\/[\d.]+/gi;
	//IE
	if(agent.indexOf("msie") > 0){
	  return agent.match(regStr_ie) ;
	}

	//firefox
	if(agent.indexOf("firefox") > 0){
	  return agent.match(regStr_ff) ;
	}

	//Chrome
	if(agent.indexOf("chrome") > 0){
	  return agent.match(regStr_chrome) ;
	}

	//Safari
	if(agent.indexOf("safari") > 0 && agent.indexOf("chrome") < 0){
	  return agent.match(regStr_saf) ;
	}
}
/**
 * 擷取作業系統版本
 * @returns {String}
 */
function detectOS() {
    var sUserAgent = navigator.userAgent;
    var isWin = (navigator.platform == "Win32") || (navigator.platform == "Windows");
    var isMac = (navigator.platform == "Mac68K") || (navigator.platform == "MacPPC") || (navigator.platform == "Macintosh") || (navigator.platform == "MacIntel");
    if (isMac) return "Mac";
    var isUnix = (navigator.platform == "X11") && !isWin && !isMac;
    if (isUnix) return "Unix";
    var isLinux = (String(navigator.platform).indexOf("Linux") > -1);
    if (isLinux) return "Linux";
    if (isWin) {
        var isWin2K = sUserAgent.indexOf("Windows NT 5.0") > -1 || sUserAgent.indexOf("Windows 2000") > -1;
        if (isWin2K) return "Win2000";
        var isWinXP = sUserAgent.indexOf("Windows NT 5.1") > -1 || sUserAgent.indexOf("Windows XP") > -1;
        if (isWinXP) return "WinXP";
        var isWin2003 = sUserAgent.indexOf("Windows NT 5.2") > -1 || sUserAgent.indexOf("Windows 2003") > -1;
        if (isWin2003) return "Win2003";
        var isWinVista= sUserAgent.indexOf("Windows NT 6.0") > -1 || sUserAgent.indexOf("Windows Vista") > -1;
        if (isWinVista) return "WinVista";
        var isWin7 = sUserAgent.indexOf("Windows NT 6.1") > -1 || sUserAgent.indexOf("Windows 7") > -1;
        if (isWin7) return "Win7";
    }
    return "other";
}

/**
 * 擷取螢幕分辨率
 * @returns {String}
 */
function getScreenResolution(){
	return window.screen.width+"*"+window.screen.height;
}