jquery Ajax Error return errors

Enter Baidu Search This problem, found that someone said a sentence

Ajax in jquery async default is True (asynchronous request), and if you want to perform another Ajax after an Ajax execution, you need to async=false it.

I handled it in Ajax.

Async:false, it turns out that submitting normal data returns is normal without errors.

The code is as follows
$.ajax ({ Type: "POST", Async:false, Url:urllink, Data:data, DataType: "HTML", Success:function (msg) { Alert (data) }, Error:function (XMLHttpRequest, Textstatus, Errorthrown) { alert (xmlhttprequest.status); alert (xmlhttprequest.readystate); alert (textstatus); }, });

Finally, add one point:

Send error may have the following two, or other procedural problems, we need to be careful.

1, data: "{}", data is empty also must pass "{}"; otherwise, the return is in XML format. and prompts ParserError.