如何在javascript中通过json解析关联数组

Question

I have a 2-D php array which i am encoding through JSON. My 2d array in php is something like this:

$array['A'][12] = 8;
$array['A'][8] = 21;

$array['B'][17] = 19;
$array['B'][9] = 12;

when I do echo json_encode($array); and alert this as Ajax xmlhttp.responsetext i get this in my alert box : {"A":{"12":"8","8":"21"},"B":{"17":"19","9":"12"}}

which is absolutely fine. Now i need to parse it in javascript so i used the JSON.parse() function. The problem is when i access the A and B fields of the string. I get this in my alert boxes: Object object . How to parse this associative array? I am a beginner in AJAX and JSON so please help.

Answer 1

var array = JSON.parse(yourResponseData);

array.A // Object
array.A['12'] //8

You can't access the key '12' via the dot syntax becase no variable name can start with a number.

Answer 2

You can use console.log() rather than alert() to see the complete structure of that parsed json object. You can easily retrieve the value by using . notation or [] brackets: For example:

var returned = JSON.parse(tran.responseText);
console.log(returned['A']['8']); //which should give you '21' based on your case