JavaScript中的JSON格式问题

Following is my JavaScript code to get JSON data:

 $(document).ready(function()
          {
               $.support.cors = true;
               $.getJSON('http://example.com/root_dir/test_json.php', function(data1)
               {
                         alert("data1= "+data1); 
               });
          });

but the above alert shows me JSON in following format-

If I hit my php script URL in browser, it shows JSON data in expected formate as shown below-

[{"name":"AB","std":"7","number":"82"},{"name":"CD","std":"9","number":"90"},{"name":"PQ","std":"12","number":"79"}]

Following is my test_json.php code-

<?php

//Create an array
$json_response = array();

        $row_array['name'] = 'AB';
        $row_array['std'] = '7';
        $row_array['number'] = '82';

         array_push($json_response,$row_array);

        $row_array['name'] = 'CD';
        $row_array['std'] ='9';
        $row_array['number'] = '90';

         array_push($json_response,$row_array);

        $row_array['name'] = 'PQ';
        $row_array['std'] = '12';
        $row_array['number'] = '79';

        //push the values in the array
        array_push($json_response,$row_array);


   echo json_encode($json_response); 
?>

getJSON decodes the JSON into a JavaScript data structure.

Concatenating it with a string will implicitly call toString() on it. That will turn arrays in to a comma-seperated format and plain objects into "[Object object]".

Nothing is going wrong. That is the expected behaviour.

If you want to see the data in JSON format, then use JSON.stringify(data) or use .ajax instead of .getJSON and access the raw text data in the jqXHR object.