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After entering www.jd.com, if the code determines that it is a mobile phone, it will jump to m.jd.com

let ua = window.navigator.userAgent.toLocaleLowerCase()
let murl ="http://m.jd.com",
let reg =/iphone|android|symbianos|windows\sphone/g

if (reg .test(ua )) {
    window.location.href = murl 
}

JD source code:

!function(n){function o(n){for(var o=n+"=",t=document.cookie.split(";"),e=0;e<t.length;e++){for(var i=t[e];" "==i.charAt(0);)i=i.substring(1,i.length);if(0==i.indexOf(o))return i.substring(o.length,i.length)}return null}var t=o("pcm"),e=n.navigator.userAgent.toLocaleLowerCase(),i="http://m.jd.com",r=/iphone|android|symbianos|windows\sphone/g,c=/micromessenger|qq\/[\d.]+/i;return c.test(e)?(n.location.!=t?(n.location.href=i,!1):void 0}(window);

Just judgeUA

request.getHeader("user-agent")

userAgent

window.navigator.userAgent