SOURCE

// 有两家地图，分别提供了show()函数渲染地址

var baiduMap = {
  show: function () {
    console.log('show baidu map');
  }
};

var googleMap = {
  show: function () {
    console.log('show google map');
  }
};

var showMap = function (mapObj) {
  mapObj.show();
};

showMap(baiduMap);
showMap(googleMap);