The JSON returned by $.ajax cannot perform the success resolution _jquery

In the evening before modifying the code, before using the

Copy Code code as follows:

$.ajax ({
..
DataType: ' JSON ',
...
Success:function (JSON) {
Do not perform success
},
Error:function (Error) {
Always execute this error
}
});

Why is this so? After a long search on the internet, it turns out that because I've specified datatype: ' JSON ', this designation is screwed up, the requirements for JSON are very strict, and at first my JSON format was written like this: "{result:{\" success\ ": \ true\", \ " Meg\ ": \" Success\ "}", you can not write this, you have to change to write: "{\" success\ ": True,\" mesg\ ": \" Success\ "}, if it is bool type, then do not use quotes, other keys/values need to be quoted.