JavaScript(js)判断浏览器类别方法

1.JavaScript(js)判断浏览器是IE

function isIE  () {
  return  !isNaN(Number(document.documentMode));
};

2.JavaScript(js)判断浏览器是Edge

function isEdge() {
  return  navigator.userAgent.indexOf('Edge') > -1;
}

3.JavaScript(js)判断浏览器是Firefox

function isFirefox() {
  return  !!window.navigator.userAgent.match(/firefox/i);
}