blocks|key|1483177|text|您可能需要发送缓存断路器。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1483178|我建议使用缓存({$.ajax:+no+})以防万一(在get请求中添加一个随机后缀)|1483179|(这些天我倾向于在任何地方使用$.ajax，更容易调整)|1483180|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|H|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|I|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|J|8|@]|9|@]|A|$]]|$1|F|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|G|$]]

You may need to send a cache-breaker. 

I would recommend using $.ajax( { cache: no }) just in case ( adds a random suffix to the get request) 

( I tend to use $.ajax everywhere these days, more tuneable )

blocks|key|1698430|text|谢谢Kent的回答。使用缓存(‘{$.ajax:+no+}')；工作正常。编辑|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1698431|或者至少我以为我知道。似乎jquery+$.getJSON没有读取对$.ajax对象所做的任何更改。|1698432|最终成功的解决方案是手动添加一个新参数|1698433|var+noCache+=+Date();
$.getJSON("/somepage/someaction",+{+"noCache":+noCache+},+Callback);|code-block|syntax|javascript|1698434|日期分辨率仅精确到分钟；这实际上意味着此解决方案仍可缓存长达一分钟。这对于我的目的来说是可以接受的。|1698435|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|P|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|Q|8|@]|9|@]|A|$]]|$1|F|3|G|5|H|7|R|8|@]|9|@]|A|$I|J]]|$1|K|3|L|5|6|7|S|8|@]|9|@]|A|$]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

Thanks Kent for your answer.
Using $.ajax('{ cache: no }'); worked perfectly.
[edit]

Or at least I thought i did. Seems that the jquery $.getJSON isn't reading any changes made to the $.ajax object.

The solution that ended up working was to add a new parameter manually

<pre><code>var noCache = Date();
$.getJSON("/somepage/someaction", { "noCache": noCache }, Callback);
</code></pre>

the date resolution is only to the minute; which effectively means this solution still caches for upto one minute. This is acceptable for my purposes.

blocks|key|1483272|text|这就是我的工作原理。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1483273|$.ajaxSetup({+cache:+false+});
$.getJSON("/MyQueryUrl",function(data,item)+{
+++++//+do+stuff+with+callback+data
+++++$.ajaxSetup({+cache:+true+});
+++});|code-block|syntax|javascript|1483274|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

This is how it worked for me...

<pre><code>$.ajaxSetup({ cache: false });
$.getJSON("/MyQueryUrl",function(data,item) {
 // do stuff with callback data
 $.ajaxSetup({ cache: true });
 });
</code></pre>

blocks|key|1698519|text|如果您使用的是ASP.net+MVC，请考虑添加一个扩展方法来轻松实现无缓存，如下所示：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1698520|++++public+static+void+NoCache(this+HttpResponse+Response)
++++{
++++++++Response.Cache.SetNoStore();
++++++++Response.Cache.SetExpires(DateTime.MinValue);
++++++++Response.Cache.SetCacheability(HttpCacheability.NoCache);
++++++++Response.Cache.SetValidUntilExpires(false);

++++++++Response.Expires+=+-1;
++++++++Response.ExpiresAbsolute+=+DateTime.MinValue;
++++++++Response.AddHeader("Cache-Control",+"no-cache");
++++++++Response.AddHeader("Pragma",+"no-cache");
++++}|code-block|syntax|javascript|1698521|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

If you're using ASP.net MVC, consider adding an extension method to easily implement no caching like so: 

<pre><code> public static void NoCache(this HttpResponse Response)
 {
 Response.Cache.SetNoStore();
 Response.Cache.SetExpires(DateTime.MinValue);
 Response.Cache.SetCacheability(HttpCacheability.NoCache);
 Response.Cache.SetValidUntilExpires(false);

 Response.Expires = -1;
 Response.ExpiresAbsolute = DateTime.MinValue;
 Response.AddHeader("Cache-Control", "no-cache");
 Response.AddHeader("Pragma", "no-cache");
 }
</code></pre>

blocks|key|1698575|text|我通过在控制器中的Action上放置以下属性解决了同样的问题：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1698576|[OutputCache(Duration+=+0,+VaryByParam+=+"None")]|code-block|syntax|javascript|1698577|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

I solved this same problem by placing the following attribute on the Action in the Controller:

<pre><code>[OutputCache(Duration = 0, VaryByParam = "None")]
</code></pre>

blocks|key|1483438|text|准备好回答了吗？|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1483439|http://lestopher.tumblr.com/post/21742012438/if-youre-using-ie8-and-getjson|offset|length|1483440|所以，只需添加|1483441|jQuery.support.cors+=+true;++|code-block|syntax|javascript|1483442|在你的脚本的开头，然后它就能工作了！|1483443|entityMap|0|LINK|mutability|MUTABLE|url^0|0|0|23|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|V|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|W|8|@]|9|@$D|X|E|Y|1|Z]]|A|$]]|$1|F|3|G|5|6|7|10|8|@]|9|@]|A|$]]|$1|H|3|I|5|J|7|11|8|@]|9|@]|A|$K|L]]|$1|M|3|N|5|6|7|12|8|@]|9|@]|A|$]]|$1|O|3|-4|5|6|7|13|8|@]|9|@]|A|$]]]|P|$Q|$5|R|S|T|A|$U|C]]]]

Ready for THE answer ?

<a href="http://lestopher.tumblr.com/post/21742012438/if-youre-using-ie8-and-getjson" rel="nofollow">http://lestopher.tumblr.com/post/21742012438/if-youre-using-ie8-and-getjson</a>

So, just add 

<pre><code>jQuery.support.cors = true; 
</code></pre>

at the beginning of your script and BANG it works !

I'm playing around with ASP.net MVC and JQuery at the moment. I've come across behavour which doesn't seem to make sense. 

I'm calling JQuery's <code>$.getJSON</code> function to populate some div's. The event is triggered on the <code>$(document).ready</code> event. This works perfectly.

There is a small <code>AJAX.BeginForm</code> which adds another value to be used when populating the divs. It calls the remote function correctly and upon success calls the original javascript function to repopulate the divs.

Here is the weird part: In FireFox and Chrome - Everything works. BUT In IE8 (Beta) this second call to the populate Div script (which calls the $.getJSON function) gets cached data and does not ask the server!

Hope this question makes sense: In a nut shell - Why is <code>$.getJSON</code> getting cached data? And why is it only effecting IE8?

$.getJSON returning cached data in IE8

服务器

jQuery

目前我正在尝试ASP.net、MVC和JQuery。我遇到过一些似乎不合常理的行为。我调用JQuery的$.getJSON函数来填充一些div，这个事件是在$(document).ready事件上触发的。这个可以完美地工作。有一个很小的AJAX.BeginForm，它添加了填充div时要使用的另一个值。它正确地调用远程...

问在IE8中返回缓存数据的$.getJSON
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