Ajax problems in jquery 1.4

When $. Ajax () is used, I set the timeout time to 3 seconds: CopyCodeThe Code is as follows: $. Ajax ({
URL: "ajaxtable1.aspx ",
Cache: false,
Error: function (XMLHttpRequest, textstatus, errorthrown ){
//
},
Success: function (HTML ){
//
},
Timeout: 3000
});

On the ajaxtable1.aspx page. sleep (1000*5); causes the page to be delayed for 5 seconds before execution. Therefore, the Ajax request times out, but the error message "error: the object does not support this operation" is reported ", I thought I had a problem with the script, but I found no errors for a long time, and finally changed the JQuery-1.3.1 after the error disappears, the code runs normally. It seems that the new version is not stable yet.