js判断客户端是pc还是手机及获取浏览器版本

//判断是pc还是移动端
    function browserRedirect() {
        var sUserAgent = navigator.userAgent.toLowerCase();
        var bIsIpad = sUserAgent.match(/ipad/i) == "ipad";
        var bIsIphoneOs = sUserAgent.match(/iphone os/i) == "iphone os";
        var bIsMidp = sUserAgent.match(/midp/i) == "midp";
        var bIsUc7 = sUserAgent.match(/rv:1.2.3.4/i) == "rv:1.2.3.4";
        var bIsUc = sUserAgent.match(/ucweb/i) == "ucweb";
        var bIsAndroid = sUserAgent.match(/android/i) == "android";
        var bIsCE = sUserAgent.match(/windows ce/i) == "windows ce";
        var bIsWM = sUserAgent.match(/windows mobile/i) == "windows mobile";
        if (bIsIpad || bIsIphoneOs || bIsMidp || bIsUc7 || bIsUc || bIsAndroid || bIsCE || bIsWM) {
           register_device="phone"
        } else {
            register_device = "pc";
        }
        var str = getBrowserName()[0];
        var arr = str.split('/');
        register_device_type = arr[0];//名字
        register_device_system = arr[1];//版本号
    }

    //获取浏览器信息 名字和版本号
    function getBrowserName(){
        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);
        }