conditionizr 蛮难用的。但浏览器检测办法还是可以学学

Chrome

conditionizr.add('chrome', [], function () {
  return !!window.chrome && !/opera|opr/i.test(navigator.userAgent);
});

Safari

conditionizr.add('safari', [], function () {
  return /constructor/i.test(window.HTMLElement);
});

Firefox

conditionizr.add('firefox', [], function () {
  return typeof InstallTrigger !== 'undefined';
});

Opera

conditionizr.add('opera', [], function () {
  return !!window.opera || /opera|opr/i.test(navigator.userAgent);
});

IE 10

conditionizr.add('ie10', [], function () {
  var version = false;
  /*@cc_on
      if (/^10/.test(@_jscript_version) && /MSIE 10\.0(?!.*IEMobile)/i.test(navigator.userAgent))
      version = true
  @*/
  return version;
});

IE 10 Touch

conditionizr.add('ie10touch', [], function () {
  return /MSIE 10\.0.*Touch(?!.*IEMobile)/i.test(navigator.userAgent);
});

IE 9

conditionizr.add('ie9', [], function () {
  var version = false;
  /*@cc_on
      if (/^9/.test(@_jscript_version) && /MSIE 9\.0(?!.*IEMobile)/i.test(navigator.userAgent))
      version = true
  @*/
  return version;
});

IE 8

conditionizr.add('ie8', [], function () {
  var version = false;
  /*@cc_on
      if (@_jscript_version > 5.7 && !/^(9|10)/.test(@_jscript_version))
      version = true
  @*/
  return version;
});

IE 7

conditionizr.add('ie7', [], function () {
  var version = false;
  /*@cc_on
      if (@_jscript_version == 5.7 && window.XMLHttpRequest && /MSIE 7\.0(?!.*IEMobile)/i.test(navigator.userAgent))
      version = true
  @*/
  return version;
});

IE 6

conditionizr.add('ie6', [], function () {
  var version = false;
  /*@cc_on
      if (@_jscript_version == 5.6 || (@_jscript_version == 5.7 && /MSIE 6\.0/i.test(navigator.userAgent)))
      version = true
  @*/
  return version;
});

Retina

conditionizr.add('retina', [], function () {
  return !!window.devicePixelRatio >= 1.5;
});

Touch

conditionizr.add('touch', [], function () {
  return !!'ontouchstart' in window || !!navigator.msMaxTouchPoints;
});

iOS

conditionizr.add('ios', [], function () {
  return /(iPad|iPhone|iPod)/i.test(navigator.userAgent);
});

Windows Phone 8

conditionizr.add('winPhone8', [], function () {
  return /Windows Phone 8.0/i.test(navigator.userAgent);
});

Windows Phone 7.5

conditionizr.add('winPhone75', [], function () {
  return /Windows Phone 7.5/i.test(navigator.userAgent);
});

Windows Phone 7

conditionizr.add('winPhone7', [], function () {
  return /Windows Phone 7.0/i.test(navigator.userAgent);
});

Mac

conditionizr.add('mac', [], function () {
  return /mac/i.test(navigator.platform);
});

Windows

conditionizr.add('windows', [], function () {
  return /win/i.test(navigator.platform);
});

Chromium

conditionizr.add('chromium', [], function () {
  return /cros i686/i.test(navigator.platform);
});

Linux

conditionizr.add('linux', [], function () {
  return /linux/i.test(navigator.platform) && !/android|cros/i.test(navigator.userAgent);
});