判断是从微信进入还是企业微信进入

<script>
    var ua= window.navigator.userAgent.toLowerCase();
    if( (ua.match(/MicroMessenger/i) == 'micromessenger') && (ua.match(/wxwork/i) == 'wxwork') ){
        alert("企业微信客户端");
    }else if( ua.match(/micromessenger/i) == 'micromessenger' ){
        alert("微信客户端");
    }
</script>