XMLHttpRequest对象的open()和send()方法有什么区别? [英] What is the difference between open( ) and send ( ) methods of XMLHttpRequest object?

问题描述

XMLHttpRequest 对象:

打开(< method>，< url>，< is async>))
发送(< request_data>)

1. 这些有何不同?为什么我们都需要同时实现ajax?
2. 此外，< request_data> 是否可以通过这两种方法传递?

1. How are these different and why do we need both to implement ajax?
2. Also, can the <request_data> be passed through both the methods ?

推荐答案

open()无法打开连接；它仅配置请求，但网络活动仅以send()的调用开始

open() does not open the connection; it only configures the request, but the network activity only starts with the call of send ()

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