XmlHttpRequest对象是AJAX的核心，该对象用于在后台与服务器之间交换数据，利用该对象不能实现（ ）。
- A.在不重新加载页面的情况下更新网页
- B.在页面已加载后从服务器请求数据
- C.在页面已加载后从服务器接收数据
- D.访问数据库服务器
正确答案及解析
正确答案
解析
本题考查AJAX的原理。
XmlHttpRequest对象是AJAX的核心。该对象用于在后台与服务器交换数据，利用该对象AJAX就可以实现：
在不重新加载页面的情况下更新页面
在页面已加载后从服务器请求数据
在页面已加载后从服务器接收数据
在后台向服务器发送数据
综合分析，本题选D。
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