MDN 文档

• Navigator

判断浏览器

• 也可以使用知名的开源库 ua-parser-js

function getBrowserInfo() {
  var nVer = navigator.appVersion,
    nAgt = navigator.userAgent,
    browser = navigator.appName,
    version = "" + parseFloat(navigator.appVersion),
    majorVersion,
    nameOffset,
    verOffset,
    ix,
    network = "unknown";

  // Opera浏览器（老版本）
  if ((verOffset = nAgt.indexOf("Opera")) != -1) {
    browser = "Opera";
    version = nAgt.substring(verOffset + 6);
    if ((verOffset = nAgt.indexOf("Version")) != -1) {
      version = nAgt.substring(verOffset + 8);
    }
  }
  // Opera浏览器（新版本）
  if ((verOffset = nAgt.indexOf("OPR")) != -1) {
    browser = "Opera";
    version = nAgt.substring(verOffset + 4);
  }
  // IE浏览器
  else if ((verOffset = nAgt.indexOf("MSIE")) != -1) {
    browser = "Microsoft Internet Explorer";
    version = nAgt.substring(verOffset + 5);
  }
  // Chrome浏览器
  else if ((verOffset = nAgt.indexOf("Chrome")) != -1) {
    browser = "Chrome";
    version = nAgt.substring(verOffset + 7);
  }
  // Safari浏览器
  else if ((verOffset = nAgt.indexOf("Safari")) != -1) {
    browser = "Safari";
    version = nAgt.substring(verOffset + 7);
    if ((verOffset = nAgt.indexOf("Version")) != -1) {
      version = nAgt.substring(verOffset + 8);
    }
  }
  // Firefox浏览器
  else if ((verOffset = nAgt.indexOf("Firefox")) != -1) {
    browser = "Firefox";
    version = nAgt.substring(verOffset + 8);
  }
  // IE11+浏览器
  else if (nAgt.indexOf("Trident/") != -1) {
    browser = "Microsoft Internet Explorer";
    version = nAgt.substring(nAgt.indexOf("rv:") + 3);
  }
  // 微信浏览器
  else if (nAgt.indexOf("NetType/") != -1) {
    browser = "WeiXin";
    if (nAgt.indexOf("NetType/WIFI") != -1) {
      network = "WIFI";
    } else if (nAgt.indexOf("NetType/2G") != -1) {
      network = "2G";
    } else if (nAgt.indexOf("NetType/3G+") != -1) {
      network = "3G+";
    }
    verOffset = nAgt.lastIndexOf("/");
    version = nAgt.substring(verOffset + 1);
    if (browser.toLowerCase() == browser.toUpperCase()) {
      browser = navigator.appName;
    }
  }
  //其他浏览器
  else if ((nameOffset = nAgt.lastIndexOf(" ") + 1) < (verOffset = nAgt.lastIndexOf("/"))) {
    browser = nAgt.substring(nameOffset, verOffset);
    version = nAgt.substring(verOffset + 1);
    if (browser.toLowerCase() == browser.toUpperCase()) {
      browser = navigator.appName;
    }
  }

  //版本字符串整理
  if ((ix = version.indexOf(";")) != -1) version = version.substring(0, ix);
  if ((ix = version.indexOf(" ")) != -1) version = version.substring(0, ix);
  if ((ix = version.indexOf(")")) != -1) version = version.substring(0, ix);
  majorVersion = parseInt("" + version, 10);
  if (isNaN(majorVersion)) {
    version = "" + parseFloat(navigator.appVersion);
    majorVersion = parseInt(navigator.appVersion, 10);
  }

  //移动版本
  var mobile = /Mobile|mini|Fennec|Android|iP(ad|od|hone)/.test(nVer);

  //系统探测
  var os = "";
  var clientStrings = [
    { s: "Windows 10", r: /(Windows 10.0|Windows NT 10.0)/ },
    { s: "Windows 8.1", r: /(Windows 8.1|Windows NT 6.3)/ },
    { s: "Windows 8", r: /(Windows 8|Windows NT 6.2)/ },
    { s: "Windows 7", r: /(Windows 7|Windows NT 6.1)/ },
    { s: "Windows Vista", r: /Windows NT 6.0/ },
    { s: "Windows Server 2003", r: /Windows NT 5.2/ },
    { s: "Windows XP", r: /(Windows NT 5.1|Windows XP)/ },
    { s: "Windows 2000", r: /(Windows NT 5.0|Windows 2000)/ },
    { s: "Windows ME", r: /(Win 9x 4.90|Windows ME)/ },
    { s: "Windows 98", r: /(Windows 98|Win98)/ },
    { s: "Windows 95", r: /(Windows 95|Win95|Windows_95)/ },
    { s: "Windows NT 4.0", r: /(Windows NT 4.0|WinNT4.0|WinNT|Windows NT)/ },
    { s: "Windows CE", r: /Windows CE/ },
    { s: "Windows 3.11", r: /Win16/ },
    { s: "Android", r: /Android/ },
    { s: "Open BSD", r: /OpenBSD/ },
    { s: "Sun OS", r: /SunOS/ },
    { s: "Linux", r: /(Linux|X11)/ },
    { s: "iOS", r: /(iPhone|iPad|iPod)/ },
    { s: "Mac OS X", r: /Mac OS X/ },
    { s: "Mac OS", r: /(MacPPC|MacIntel|Mac_PowerPC|Macintosh)/ },
    { s: "QNX", r: /QNX/ },
    { s: "UNIX", r: /UNIX/ },
    { s: "BeOS", r: /BeOS/ },
    { s: "OS/2", r: /OS\/2/ },
    { s: "Search Bot", r: /(nuhk|Googlebot|Yammybot|Openbot|Slurp|MSNBot|Ask Jeeves\/Teoma|ia_archiver)/ },
  ];
  for (var id in clientStrings) {
    var cs = clientStrings[id];
    if (cs.r.test(nAgt)) {
      os = cs.s;
      break;
    }
  }
  var osVersion = "";
  if (/Windows/.test(os)) {
    osVersion = /Windows (.*)/.exec(os)[1];
    os = "Windows";
  }
  switch (os) {
    case "Mac OS X":
      osVersion = /Mac OS X (10[\.\_\d]+)/.exec(nAgt)[1];
      break;
    case "Android":
      osVersion = /Android ([\.\_\d]+)/.exec(nAgt)[1];
      break;
    case "iOS":
      osVersion = /OS (\d+)_(\d+)_?(\d+)?/.exec(nVer);
      osVersion = osVersion[1] + "." + osVersion[2] + "." + (osVersion[3] | 0);
      break;
  }

  //返回数据集合
  return {
    //操作系统
    os: os,

    //操作系统版本
    osVersion: osVersion ? osVersion : "unknown",

    //是否移动端访问
    mobile: mobile,

    //浏览器类型
    browser: browser,

    //浏览器版本
    browserVersion: version,

    //浏览器major版本
    browserMajorVersion: majorVersion,
  };
}

获取浏览器是否阻止第三方 cookie

• navigator.cookieEnabled

console.log(navigator.cookieEnabled);

获取主机信息

// 内存
const memory = navigator.deviceMemory;

// 可用于运行线程的逻辑处理器数量(不是实际 CPU 物理核心数)
// 比如: 14 核 20 线程, 那么获取的就是 20
const workers = navigator.hardwareConcurrency;

// 获取浏览器 UI 设置的语言信息, 多用于多语言适配
// https://datatracker.ietf.org/doc/html/rfc5646
const language = navigator.language;

获取网络信息(2/3/4g)

• NetworkInfomation

const netInfo = navigator.connection;
const isOnline = navigator.onLine;
const isOffline = navigator.offLine;

操作浏览器剪切板

• Clipboard API

async function readClipboard() {
  const clipText = await navigator.clipboard.readText();
  console.log(clipText);
}

await readClipboard();