返回数据之后，只会更新部分页面。
When the data comes back, just a portion of the page is updated.
Ajax通过在服务器中检索部分页面和刷新浏览器以实现高交互性。
Ajax achieves high interactivity through only partial page retrieval from a server and refresh in a browser.
自动更新部分页面使用户摆脱了刷新之苦，但对Web服务器架构却是一场灾难。
Parts of a page that update automatically can certainly be a refreshing change for users, but they can also be an architectural nightmare for your Web servers.
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