这是一个比匹配更有效的userAgent解决方案…

function _isMobile(){
    // if we want a more complete list use this: http://detectmobilebrowsers.com/
    // str.test() is more efficent than str.match()
    // remember str.test is case sensitive
    var isMobile = (/iphone|ipod|android|ie|blackberry|fennec/).test
         (navigator.userAgent.toLowerCase());
    return isMobile;
}

返回'ontouchstart'在window && window.screen. availwidth < 768

这个怎么样，它扩展了上面的答案，但也检查了屏幕大小

使用Regex:

/* eslint-disable */
export const IS_MOBILE = (function (a) {
  return (
    /(android|bb\d+|meego).+mobile|avantgo|bada\/|blackberry|blazer|compal|elaine|fennec|hiptop|iemobile|ip(hone|od)|iris|kindle|lge |maemo|midp|mmp|mobile.+firefox|netfront|opera m(ob|in)i|palm( os)?|phone|p(ixi|re)\/|plucker|pocket|psp|series(4|6)0|symbian|treo|up\.(browser|link)|vodafone|wap|windows ce|xda|xiino/i.test(a)||/1207|6310|6590|3gso|4thp|50[1-6]i|770s|802s|a wa|abac|ac(er|oo|s\-)|ai(ko|rn)|al(av|ca|co)|amoi|an(ex|ny|yw)|aptu|ar(ch|go)|as(te|us)|attw|au(di|\-m|r |s )|avan|be(ck|ll|nq)|bi(lb|rd)|bl(ac|az)|br(e|v)w|bumb|bw\-(n|u)|c55\/|capi|ccwa|cdm\-|cell|chtm|cldc|cmd\-|co(mp|nd)|craw|da(it|ll|ng)|dbte|dc\-s|devi|dica|dmob|do(c|p)o|ds(12|\-d)|el(49|ai)|em(l2|ul)|er(ic|k0)|esl8|ez([4-7]0|os|wa|ze)|fetc|fly(\-|_)|g1 u|g560|gene|gf\-5|g\-mo|go(\.w|od)|gr(ad|un)|haie|hcit|hd\-(m|p|t)|hei\-|hi(pt|ta)|hp( i|ip)|hs\-c|ht(c(\-| |_|a|g|p|s|t)|tp)|hu(aw|tc)|i\-(20|go|ma)|i230|iac( |\-|\/)|ibro|idea|ig01|ikom|im1k|inno|ipaq|iris|ja(t|v)a|jbro|jemu|jigs|kddi|keji|kgt( |\/)|klon|kpt |kwc\-|kyo(c|k)|le(no|xi)|lg( g|\/(k|l|u)|50|54|\-[a-w])|libw|lynx|m1\-w|m3ga|m50\/|ma(te|ui|xo)|mc(01|21|ca)|m\-cr|me(rc|ri)|mi(o8|oa|ts)|mmef|mo(01|02|bi|de|do|t(\-| |o|v)|zz)|mt(50|p1|v )|mwbp|mywa|n10[0-2]|n20[2-3]|n30(0|2)|n50(0|2|5)|n7(0(0|1)|10)|ne((c|m)\-|on|tf|wf|wg|wt)|nok(6|i)|nzph|o2im|op(ti|wv)|oran|owg1|p800|pan(a|d|t)|pdxg|pg(13|\-([1-8]|c))|phil|pire|pl(ay|uc)|pn\-2|po(ck|rt|se)|prox|psio|pt\-g|qa\-a|qc(07|12|21|32|60|\-[2-7]|i\-)|qtek|r380|r600|raks|rim9|ro(ve|zo)|s55\/|sa(ge|ma|mm|ms|ny|va)|sc(01|h\-|oo|p\-)|sdk\/|se(c(\-|0|1)|47|mc|nd|ri)|sgh\-|shar|sie(\-|m)|sk\-0|sl(45|id)|sm(al|ar|b3|it|t5)|so(ft|ny)|sp(01|h\-|v\-|v )|sy(01|mb)|t2(18|50)|t6(00|10|18)|ta(gt|lk)|tcl\-|tdg\-|tel(i|m)|tim\-|t\-mo|to(pl|sh)|ts(70|m\-|m3|m5)|tx\-9|up(\.b|g1|si)|utst|v400|v750|veri|vi(rg|te)|vk(40|5[0-3]|\-v)|vm40|voda|vulc|vx(52|53|60|61|70|80|81|83|85|98)|w3c(\-| )|webc|whit|wi(g |nc|nw)|wmlb|wonu|x700|yas\-|your|zeto|zte\-/i
      .test(
        a.substr(0,4)
      )
  )
  // @ts-ignore
})(navigator.userAgent || navigator.vendor || window.opera)
/* eslint-enable */

下面是迈克尔•扎波罗哲茨(Michael Zaporozhets)回答的一个不那么含糊的版本。它还使用检查仅在第一次调用时构建正则表达式。关于从正则表达式数组构建字符串的技术，请参阅此回答。

var gRE = null;
var gRE4 = null;

function PlatformIsMobile()
{
    var e;
    
    if ( gRE == null )
    {
        e =
            [
                /(android|bb\d+|meego).+mobile|avantgo/,
                /bada\/|blackberry|blazer|compal|elaine|fennec|hiptop|iemobile/,
                /ip(hone|od)|iris|kindle|lge |maemo|midp|mmp|mobile.+firefox/,
                /netfront|opera m(ob|in)i|palm( os)?|phone|p(ixi|re)\/|plucker/,
                /pocket|psp|series(4|6)0|symbian|treo|up\.(browser|link)|vodafone/,
                /wap|windows ce|xda|xiino|android|ipad|playbook|silk/
            ];
        
        gRE = new RegExp(
            e.map( function( r ) { return r.source } ).join( "|" ), "i"
        );
    }
    
    if ( gRE4 == null )
    {
        e =
            [
                /1207|6310|6590|3gso|4thp|50[1-6]i|770s|802s|a wa/,
                /abac|ac(er|oo|s\-)|ai(ko|rn)|al(av|ca|co)|amoi|an(ex|ny|yw)/,
                /aptu|ar(ch|go)|as(te|us)|attw|au(di|\-m|r |s )|avan/,
                /be(ck|ll|nq)|bi(lb|rd)|bl(ac|az)|br(e|v)w|bumb|bw\-(n|u)/,
                /c55\/|capi|ccwa|cdm\-|cell|chtm|cldc|cmd\-|co(mp|nd)|craw/,
                /da(it|ll|ng)|dbte|dc\-s|devi|dica|dmob|do(c|p)o|ds(12|\-d)/,
                /el(49|ai)|em(l2|ul)|er(ic|k0)|esl8|ez([4-7]0|os|wa|ze)|fetc|fly(\-|_)/,
                /g1 u|g560|gene|gf\-5|g\-mo|go(\.w|od)|gr(ad|un)/,
                /haie|hcit|hd\-(m|p|t)|hei\-|hi(pt|ta)|hp( i|ip)|hs\-c|ht(c(\-| |_|a|g|p|s|t)|tp)|hu(aw|tc)/,
                /i\-(20|go|ma)|i230|iac( |\-|\/)|ibro|idea|ig01|ikom|im1k|inno|ipaq|iris/,
                /ja(t|v)a|jbro|jemu|jigs|kddi|keji|kgt( |\/)|klon|kpt |kwc\-|kyo(c|k)/,
                /le(no|xi)|lg( g|\/(k|l|u)|50|54|\-[a-w])|libw|lynx/,
                /m1\-w|m3ga|m50\/|ma(te|ui|xo)|mc(01|21|ca)|m\-cr|me(rc|ri)/,
                /mi(o8|oa|ts)|mmef|mo(01|02|bi|de|do|t(\-| |o|v)|zz)|mt(50|p1|v )|mwbp|mywa|n10[0-2]/,
                /n20[2-3]|n30(0|2)|n50(0|2|5)|n7(0(0|1)|10)|ne((c|m)\-|on|tf|wf|wg|wt)|nok(6|i)|nzph/,
                /o2im|op(ti|wv)|oran|owg1/,
                /p800|pan(a|d|t)|pdxg|pg(13|\-([1-8]|c))|phil|pire|pl(ay|uc)|pn\-2|po(ck|rt|se)|prox|psio|pt\-g/,
                /qa\-a|qc(07|12|21|32|60|\-[2-7]|i\-)|qtek/,
                /r380|r600|raks|rim9|ro(ve|zo)/,
                /s55\/|sa(ge|ma|mm|ms|ny|va)|sc(01|h\-|oo|p\-)|sdk\/|se(c(\-|0|1)|47|mc|nd|ri)/,
                /sgh\-|shar|sie(\-|m)|sk\-0|sl(45|id)|sm(al|ar|b3|it|t5)|so(ft|ny)|sp(01|h\-|v\-|v )|sy(01|mb)/,
                /t2(18|50)|t6(00|10|18)|ta(gt|lk)|tcl\-|tdg\-|tel(i|m)|tim\-|t\-mo/,
                /to(pl|sh)|ts(70|m\-|m3|m5)|tx\-9|up(\.b|g1|si)|utst/,
                /v400|v750|veri|vi(rg|te)|vk(40|5[0-3]|\-v)|vm40|voda|vulc|vx(52|53|60|61|70|80|81|83|85|98)/,
                /w3c(\-| )|webc|whit|wi(g |nc|nw)|wmlb|wonu|x700|yas\-|your|zeto|zte\-/
            ];
        
        gRE4 = new RegExp(
            e.map( function( r ) { return r.source } ).join( "|" ), "i"
        );
    }
    
    var key = navigator.userAgent || navigator.vendor || window.opera;
    
    return gRE.test( key ) ||
           gRE4.test( key.substr( 0, 4 ) );
}

为了增加额外的控制层，我使用HTML5存储来检测它是使用移动存储还是桌面存储。如果浏览器不支持存储，我有一个移动浏览器名称数组，并将用户代理与数组中的浏览器进行比较。

这很简单。函数如下:

// Used to detect whether the users browser is an mobile browser
function isMobile() {
    ///<summary>Detecting whether the browser is a mobile browser or desktop browser</summary>
    ///<returns>A boolean value indicating whether the browser is a mobile browser or not</returns>

    if (sessionStorage.desktop) // desktop storage 
        return false;
    else if (localStorage.mobile) // mobile storage
        return true;

    // alternative
    var mobile = ['iphone','ipad','android','blackberry','nokia','opera mini','windows mobile','windows phone','iemobile']; 
    for (var i in mobile) if (navigator.userAgent.toLowerCase().indexOf(mobile[i].toLowerCase()) > 0) return true;

    // nothing found.. assume desktop
    return false;
}

以下是我对这个问题的重新思考的解决方案。仍然不完美。唯一真正的解决方案是设备制造商开始认真对待“移动”和“平板”用户代理字符串。

window.onload = userAgentDetect;
function userAgentDetect() {
  if(window.navigator.userAgent.match(/Mobile/i)
  || window.navigator.userAgent.match(/iPhone/i)
  || window.navigator.userAgent.match(/iPod/i)
  || window.navigator.userAgent.match(/IEMobile/i)
  || window.navigator.userAgent.match(/Windows Phone/i)
  || window.navigator.userAgent.match(/Android/i)
  || window.navigator.userAgent.match(/BlackBerry/i)
  || window.navigator.userAgent.match(/webOS/i)) {
    document.body.className += ' mobile';
    alert('True - Mobile - ' + navigator.userAgent);
  } else {
    alert('False - Mobile - ' + navigator.userAgent);
  }
  if(window.navigator.userAgent.match(/Tablet/i)
  || window.navigator.userAgent.match(/iPad/i)
  || window.navigator.userAgent.match(/Nexus 7/i)
  || window.navigator.userAgent.match(/Nexus 10/i)
  || window.navigator.userAgent.match(/KFAPWI/i)) {
    document.body.className -= ' mobile';
    document.body.className += ' tablet';
    alert('True - Tablet - ' + navigator.userAgent);
  } else {
    alert('False - Tablet - ' + navigator.userAgent);
  }
}

当Nexus 7平板电脑只有Android UA字符串时会发生什么?首先，Mobile变成true，之后Tablet也变成true，但是Tablet会从body标签中删除Mobile UA字符串。

CSS:

body.tablet { background-color: green; }
body.mobile { background-color: red; }

为开发添加了警报线。Chrome控制台可以模拟许多手持设备。测试。

编辑:

不要使用这种方法，而是使用特征检测。市场上有如此多的设备和品牌，瞄准一个品牌永远不是正确的解决方案。