要获得最新的地图数据，我们建议您使用地图加载器。
To get the latest map data, we recommend you to use map Loader.
浏览器首次加载foodstamps . html时，只是将usa_map . svg当作一个图像，并构造一个可显示的页面，地图作为嵌入式图形对象。
As an image, and constructs a displayable page with the map as an embedded graphic object. This is the effect of the element.
通过以下方式请求一张地图：构造一个请求，发送给服务器，再直接加载到 元素。
You request a map by assembling the request and posting it to the server, loading it directly into a element.
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