js-syntaxerror:json.parse:unexpected character at line 1 column 2 of the JSON data jquery-1.9.1.min.js:3:4315

FF occasionally reported this mistake, the nearest section to do the project, it is generally I get the parameters in the form through jquery (or directly get parameters, and through Ajax asynchronous request, if there is a mistake, hold the error!)

The corresponding, if in Google Chrome, will be reported: uncaught syntaxerror:unexpected Token <

I think Google Chrome's mistake is a bit inaccurate.

Although the error in the topic is very broad, but the nearest paragraph to do the project, is roughly the case.

In fact, there are many types of "error request Parameters": include: the Accept or request parameter in Struts2 's action does not correspond, or there is no corresponding Getter/setter method. And so on.

js-syntaxerror:json.parse:unexpected character at line 1 column 2 of the JSON data jquery-1.9.1.min.js:3:4315