About different devices loading different pages

scenario:

htmlpc  vue   
 pc  

question:

May.31,2021

js judges that if it is a mobile device, it will jump to the mobile site, and if it is a pc device, it will not jump.

        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) {//
                window.location.href = 'mobile';
        }

it is better for the backend to judge based on the ua in the request, and then return a different page.
the front end had better not make this judgment and jump.

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