jquery Ajax a problem with the pit daddy

Problem Description: jquery ajax datatype JSON, if the JSON data is not strict, do not enter the Success method, the console will not error.

Data.json

1 {"result": "0", "Data": 2016-04-27}

Ajax General Notation Code:

1 $.ajax ({2     URL: ' Data.json ',3     type: ' POST ',4     DataType: ' JSON ',5     function(data) {6         Console.log (data); 7     }8 });

The above code is probably the most common use of coder, if the server returned a data format such as Data.json, this code without any problems, the console also did not error, but will not execute the Success method (a small problem, it took half an hour to find out, I wonder if you crossing not stepped on this hole. If you call the JSON format method on this JSON data, you will get an error:

1 json.parse (' {' result ': ' 0 ', ' Data ': 2016-04-27} '); // Console Error: SyntaxError:JSON.parse:expected ', ' or '} ' after property value ' in ' Line 1 ' column ' of the JSON data 

Before encountering this problem, the small one also thinks that the error method is of no use, but if this code is added to the error method, it will prompt for errors:

1 $.ajax ({2URL: ' Data.json ',3Type: ' POST ',4DataType: ' JSON ',5Successfunction(data) {6Console.log (123);7     },8Errorfunction(){9Console.log ("Data Error");//Console output: "Data Error"Ten     } One});

Recommended Promise notation:

1 $.ajax ({2     URL: ' Data.json ',3     type: ' POST ',4     DataType: ' JSON '5 }). Done (function() {6     console.log ("Success") ); 7 }). Fail (function() {8     console.log ("error"); 9 });

Summary: After encountering this hole, tell the small one truth, the error method is necessary, although it seems to have no effect, but occasional error hints are necessary.

jquery Ajax a problem with the pit daddy