ajax访问超时怎么办?服务器处理时间过长,或网速很慢,服务器返回数据很慢等,于是想到使用timeout设置,网上有类似代码:

经测试:async必须设置为同步ture,timeout才生效;如果设置为异步,则锁住浏览器,禁止一切操作,直到请求有返回结果。
官网说明
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timeout
Type: Number
Set a timeout (in milliseconds) for the request. This will override any global timeout set with $.ajaxSetup(). The timeout period starts at the point the$.ajaxcall is made; if several other requests are in progress and the browser has no connections available, it is possible for a request to time out before it can be sent. In jQuery 1.4.x and below, the XMLHttpRequest object will be in an invalid state if the request times out; accessing any object members may throw an exception. In Firefox 3.0+ only, script and JSONP requests cannot be cancelled by a timeout; the script will run even if it arrives after the timeout period.
本文探讨了AJAX请求中出现访问超时的情况及解决方案。指出通过设置timeout参数可以有效控制请求等待时间,但需注意其对同步与异步请求的影响及不同浏览器间的兼容性问题。

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