Browser 이름 및 버전 체크 snippet

function browser() {
  var userAgent = navigator.userAgent,
    match =
      userAgent.match(
        /(opera|chrome|crios|safari|ucbrowser|firefox|msie|trident(?=\/))\/?\s*(\d+)/i
      ) || [],
    result = {},
    tem;

  if (/trident/i.test(match[1])) {
    tem = /\brv[ :]+(\d+)/g.exec(userAgent) || [];
    result.name = 'Internet Explorer';
  } else if (match[1] === 'Chrome') {
    tem = userAgent.match(/\b(OPR|Edge)\/(\d+)/);

    if (tem && tem[1]) {
      result.name = tem[0].indexOf('Edge') === 0 ? 'Edge' : 'Opera';
    }
  }
  if (!result.name) {
    tem = userAgent.match(/version\/(\d+)/i); // iOS support
    result.name = match[0].replace(/\/.*/, '');

    if (result.name.indexOf('MSIE') === 0) {
      result.name = 'Internet Explorer';
    }
    if (userAgent.match('CriOS')) {
      result.name = 'Chrome';
    }
  }
  if (tem && tem.length) {
    match[match.length - 1] = tem[tem.length - 1];
  }

  result.version = Number(match[match.length - 1]);

  return result;
}

/*  Result
{name: "Opera", version: 63}
{name: "Firefox", version: 69}
{name: "Safari", version: 12}
{name: "Chrome", version: 77}
{name: "Internet Explorer", version: 11}
{name: "Edge", version: 17}
*/