Map Zoom Out

At this point, you have a fully functional map pulling data in from multiple sources, including default functionality to pan with the mouse and zoom in and out with the mouse wheel.

此时，您就拥有了一个完全可以发挥作用的地图，可从多个资源拉入数据，包括默认的用鼠标平移以及用鼠标滑轮缩放的功能。

By default, OpenLayers provides mouse wheel-based zoom in and out and mouse-based panning. You can also add on-map controls - for example.

默认地，OpenLayers提供基于鼠标滑轮的缩放以及基于鼠标的平移功能。

Now that the map is functional, you can zoom the map to your area of interest, rather than leaving it zoomed out to the entire United States.

地图已经可以发挥作用后，现在就可以将地图缩放到您感兴趣的区域，而不是让地图保持缩小于整个美国。