An analysis of the problems encountered in different browsers when invoking Ajax methods in jquery _jquery

Today, with Firefox debugging a way to use jquery inside the package of interaction with the background, Firefox anyway does not play windows.
And the previous use of Google browser smoothly through. It was then found that the browser defaults were handled differently by the respective browsers. Summarize:
If you return a JSON, you should take this argument and return the same text.
$.post (url,param,function (data), param);//The last parameter param the type of the corresponding return information, generally to be taken, to avoid
Problems caused by the differences in the default settings for different browsers.