js判断是否移动端

<script type="text/javascript" charset="utf-8">
            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 phone/i) == "windows mobile";
            var bIsMobile = sUserAgent.match(/mobile/i) == "mobile";
            var bIsPlaybook = sUserAgent.match(/playbook/i) == "playbook";
    
            document.writeln("您的浏览设备为：");
            if (bIsIpad || bIsIphoneOs || bIsMidp || bIsUc7 || bIsUc || bIsAndroid || bIsCE || bIsWM || bIsMobile || bIsPlaybook) {
                document.writeln("phone");
            } else {
                document.writeln("pc");
            }
        }

        browserRedirect();
              
    </script>