```
<script>
function mapRender(map){
map.render();
}
function GoogleMap(){
}
GoogleMap.prototype.render = function(){
console.log("google渲染")
}
function BaiduMap(){
}
BaiduMap.prototype.render = function(){
console.log("百度渲染")
}
mapRender(new GoogleMap())
mapRender(new BaiduMap())
</script>
```
