//判断是否IE<11浏览器

export function isIE() {

  return navigator.userAgent.indexOf('compatible') > -1 && navigator.userAgent.indexOf('MSIE') > -1;

}



export function isIE11() {

  return navigator.userAgent.indexOf('Trident') > -1 && navigator.userAgent.indexOf('rv:11.0') > -1;

}



//判断是否IE的Edge浏览器

export function isEdge() {

  return navigator.userAgent.indexOf('Edge') > -1 && !isIE();

}



export function getIEVersion() {

  let userAgent = navigator.userAgent; //取得浏览器的userAgent字符串

  let isIE = isIE();

  let isIE11 = isIE11();

  let isEdge = isEdge();



  if (isIE) {

    let reIE = new RegExp('MSIE (\\d+\\.\\d+);');

    reIE.test(userAgent);

    let fIEVersion = parseFloat(RegExp['$1']);

    if (fIEVersion === 7 || fIEVersion === 8 || fIEVersion === 9 || fIEVersion === 10) {

      return fIEVersion;

    } else {

      return 6; //IE版本<7

    }

  } else if (isEdge) {

    return 'edge';

  } else if (isIE11) {

    return 11;

  } else {

    return -1;

  }

}