readyState的五种状态

本文详细介绍了XMLHttpRequest对象的readyState属性的五种状态及其含义,包括未初始化、载入、载入完成、交互和完成等阶段,帮助读者理解HTTP请求的不同阶段。

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 There are five possible values for readyState:
0 (Uninitialized): The object has been created but the open() method hasn't been called.
1 (Loading): The open() method has been called but the request hasn't been sent.
2 (Loaded): The request has been sent.
3 (Interactive). A partial response has been received.
4 (Complete): All data has been received and the connection has been closed.

readyState有五种可能的值:
0 (未初始化): (XMLHttpRequest)对象已经创建,但还没有调用open()方法。
1 (载入):已经调用open() 方法,但尚未发送请求。
2 (载入完成): 请求已经发送完成。
3 (交互):可以接收到部分响应数据。
4 (完成):已经接收到了全部数据,并且连接已经关闭。

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