XMLHttpRequest函数不起作用
问题描述：
我已经创建了一个XMLHttpRequest函数，但它没有用，这是我的代码
Hi, i have created a XMLHttpRequest function, but it didn''t work, this is my code
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答
据我所知，您首先打开连接，然后附加处理程序，然后发送异步请求。在同步请求的情况下，你将在.send（）之后执行处理程序。
as far as I know, you first open the connection, then attach the handler and then send the asyncronous request. in case of a syncronous request, you would execute the handler after .send().
它没有工作，它没有运行CatchResult（）！
It didn''t work, it didn''t run CatchResult() !
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你确定，？a = r指向正确的位置？
are you sure, "?a=r" points to the right location?