如何在 jQuery 中为 getJSON 设置缓存 false？
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How to set cache false for getJSON in jQuery?
提问by Abhinav
I am using getJSONto fetch the results from server side but facing browser cache problems. I want the cache to be false. I tried using this just before my getJSONcall.
我正在使用getJSON从服务器端获取结果但面临浏览器缓存问题。我希望缓存为假。我在getJSON打电话之前尝试使用它。
$.ajaxSetup({
cache: false
})
But I am not getting the expected results. It still shows the old results.
但我没有得到预期的结果。它仍然显示旧的结果。
I also identified some other solutions such as using .ajaxbut I really don't want to use that.
我还确定了一些其他解决方案，例如使用，.ajax但我真的不想使用它。
回答by bonesnatch
Your code just needs a trigger for it to be enabled.
您的代码只需要一个触发器即可启用它。
This will allow you to disable cache in all future ajax
这将允许您在以后的所有 ajax 中禁用缓存
$(document).ready(function() {
$.ajaxSetup({ cache: false });
});
Hope it helps :)
希望能帮助到你 ：）
回答by semente
You can use either this, that will disable cache globally:
您可以使用它，这将全局禁用缓存：
$(document).ready(function() {
$.ajaxSetup({ cache: false });
});
or that, instead of $.getJSON, to disable the cache just for such request:
或者，而不是$.getJSON，仅针对此类请求禁用缓存：
$.ajax({
cache: false,
url: "/path/to.json",
dataType: "json",
success: function(data) {
...
}
});
回答by TriumphST
semente's and bonesnatch's answers are correct, but if you want to use $.getJSON and elsewhere take advantage of it's caching (you don't want to set the cache to false for all calls), but you want to bust the cache just for a single call, you can inject a timestamp into data property of $.getJSON(). By adding a unique value to the query string of the request, the request will always be unique and not be cached by the browser - you will always get the latest data.
semente 和 bonenatch 的答案是正确的，但是如果您想使用 $.getJSON 和其他地方，请利用它的缓存（您不想将所有调用的缓存设置为 false），但您只想破坏缓存单个调用，您可以将时间戳注入 $.getJSON() 的数据属性。通过向请求的查询字符串添加唯一值，请求将始终是唯一的，不会被浏览器缓存——您将始终获得最新数据。
Long version:
长版：
var ts = new Date().getTime();
var data = {_: ts};
var url = '/some/path.json';
$.getJSON(url, data);
All in one version:
合一版本：
$.getJSON('/some/path', {_: new Date().getTime()});
Both result in the following request:
两者都会导致以下请求：
/some/path.json?_=1439315011130
where the number at the end is the timestamp for the moment that the code is called and will therefore always be unique.
其中末尾的数字是调用代码时的时间戳，因此将始终是唯一的。
