SOURCE

var googleMap = {
    show:function (){
        console.log("开始渲染谷歌")
    }
}
var baiduMap = {
    display:function (){
        console.log("开始渲染百度")
    }
}

var baiduMapAdatee = {
    show:function(){
        baiduMap.display();
    }
}
var renderMap = function(map){
    if(map.show instanceof Function){
        map.show()
    }
}

renderMap(googleMap);
renderMap(baiduMapAdatee);