import isIE from '../../EnvironmentalJudgment/isIE';
import isEdge from '../../EnvironmentalJudgment/isEdge';
import isIE11 from '../../EnvironmentalJudgment/isIE11';

const IEVersion = () => {
  let userAgent = navigator.userAgent; //取得浏览器的userAgent字符串

  if (isIE()) {
    let reIE = new RegExp('MSIE (\\d+\\.\\d+);');
    reIE.test(userAgent);

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

    if (fIEVersion == 7) {
      return 7;
    } else if (fIEVersion == 8) {
      return 8;
    } else if (fIEVersion == 9) {
      return 9;
    } else if (fIEVersion == 10) {
      return 10;
    } else {
      return 6; //IE版本<=7
    }
  } else if (isEdge()) {
    return 'edge'; // edge
  } else if (isIE11()) {
    return 11; // IE11
  } else {
    return -1; // 不是ie浏览器
  }
};

export default IEVersion;