迭代json数组

我想获得json数组的值使用.each

我在这里设置数组

$allRecords= array();
    while($row = mysql_fetch_array($result)){
        $oneRecord[] = array("orderNo"=>$row['order_no'],"orderDate"=>$row['order_date'],"orderTime"=>$row['order_Time']);
        array_push(&$allRecords,$oneRecord);
    }
    echo json_encode($allRecords);

$.post("controllers/OrderViewer.controller.php?action=viewOrders",param,function(result){
 // var data = JSON.parse(result); // I tried this but doesn't work
 // var data= eval(result);  // I tried this but doesn't work
    $.each(result,function(index,v){
            alert(index +" "+ v.orderNo);  // return undefined for values
            // what should I write here to reach array element
    });
    });

我应该在。each中写什么来获取数组元素

这是响应数据结构

Array
(
[0] => Array
    (
        [orderNo] => 1
        [orderDate] => 2011-02-12
        [orderTime] => 00:00:10
    )
[1] => Array
    (
        [orderNo] => 2
        [orderDate] => 2011-02-12
        [orderTime] => 11:10:00
    )

)