javascript——readyState

最新推荐文章于 2024-02-08 19:08:10 发布

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最新推荐文章于 2024-02-08 19:08:10 发布

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文章标签： javascript ViewUI

原文链接：http://www.cnblogs.com/chear/archive/2013/04/06/3002014.html

本文详细解释了XMLHttpRequest的readyState状态的五种不同阶段：未初始化、载入、载入完成、交互和完成，帮助开发者了解HTTP请求的生命周期。

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0: (Uninitialized) the send( ) method has not yet been invoked.
1: (Loading) the send( ) method has been invoked, request in progress.
2: (Loaded) the send( ) method has completed, entire response received.
3: (Interactive) the response is being parsed.
4: (Completed) the response has been parsed, is ready for harvesting.

0 －（未初始化）还没有调用send()方法
1 －（载入）已调用send()方法，正在发送请求
2 －（载入完成）send()方法执行完成，已经接收到全部响应内容
3 －（交互）正在解析响应内容
4 －（完成）响应内容解析完成，可以在客户端调用了

对于readyState的这五种状态，其他书中大都语焉不详。像《Foundations of Ajax》中，只在书中的表2-2简单地列举了状态的“名称”－－The state of the request. The five possible values are 0 = uninitialized, 1 = loading, 2 = loaded, 3 = interactive, and 4 = complete。而《Ajax in Action》中好像根本就没有提到这5种状态的细节。《Professional Ajax》中虽不尽人意，但还是有可取之处：

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。

转载于:https://www.cnblogs.com/chear/archive/2013/04/06/3002014.html