Method isIE

src/openlayers/mapping/WebMap.js:5383–5388

* @private * @function WebMap.prototype.isIE * @description 判断当前浏览器是否为IE * @returns {boolean}

()

   * @returns {boolean}
   */
  isIE() {
    if (!!window.ActiveXObject || 'ActiveXObject' in window) {
      return true;
    }
    return false;
  }

  /**
   * @private