javascript jquery ajax中可以设置的最大超时时间是多少？
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what is the maximum timeout can be set in jquery ajax?
提问by Jianxun Lian
$.ajax(
url:"",
async: true,
timeout: 2*60*60*1000, //2 hours,
success: function(){},
error: function(){}
);
In a jQuery ajax request, if I set the timeout with a big value, or left it empty, will it keep waiting until the server returns a result?
在 jQuery ajax 请求中，如果我将超时设置为大值，或者将其留空，它会一直等待直到服务器返回结果吗？
Actually, I expect the server will response in 1.5 hours, so in my js script I set timeout to 2 hours, but I found the Ajax jump to error function (with msg code 404) in less than 1 hour. It means ajax abort the waiting ahead of the time .
实际上，我预计服务器会在 1.5 小时内响应，所以在我的 js 脚本中我将超时设置为 2 小时，但我发现 Ajax 跳转到错误函数（带有 msg 代码 404）不到 1 小时。这意味着 ajax 提前中止等待。
So I wonder if there is a maximum timeout value can ajax be set?
所以我想知道ajax是否可以设置最大超时值？
回答by Matas Vaitkevicius
My previous answer was wrong (timeout just seemed to be to short and I couldn't believe it myself) so I have done a test yesterday, created 1GB zip then throttled my connection with fiddler and wrote this aspx page.
我之前的答案是错误的（超时似乎很短，我自己都不敢相信）所以我昨天做了一个测试，创建了 1GB zip，然后限制了我与 fiddler 的连接并编写了这个 aspx 页面。
public partial class Ajaxtest : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
Response.Clear();
Response.BufferOutput = false;
Response.WriteFile("c://OnTheMoveOffline.zip");
}
}
then I ran this script (interestingly fiddler blew up with OutOfMemory exception within 10 seconds however response was held).
然后我运行了这个脚本（有趣的是，fiddler 在 10 秒内因 OutOfMemory 异常而爆炸，但响应被保留）。
var f = function(){
var compareDate = new Date();
$.ajax({
url : 'http://localhost:22037/FeatureDev/Ajaxtest.aspx',
success: function(data){ console.log(Math.abs(new Date() - compareDate));},
error : function(e){ console.log(Math.abs(new Date() - compareDate));},
timeout : 10000000
}).done(function() {
console.log(Math.abs(new Date() - compareDate));
})
.fail(function() {
console.log(Math.abs(new Date() - compareDate));
})
.always(function() {
console.log(Math.abs(new Date() - compareDate));
});}
It came back with
它回来了
9393076
9393081
9393081
9393076/1000 ~ 9393(s) = 02:36:33
9393076/1000 ~ 9393(s) = 02:36:33
Which equals to ~156 minutes.
这等于 ~156 分钟。
I will repeat this test this weekend to see if it will timeout after same amount of time, but so far it seems it is more than 7200000 (2*60*60*1000).
我将在本周末重复此测试，看看它是否会在相同的时间后超时，但到目前为止似乎超过 7200000 (2*60*60*1000)。
回答by Sebastian Xawery Wi?niowiecki
Default global value of timeoutis 0 that means it is infinite.
的默认全局值为timeout0，表示它是无限的。
