jquery - Iterating thru an array using javascript for

How do I iterate thru an array like this using 'for' in jquery. This one has me totally lost. I cant figure how to get those values out from an array like this and I cant change the way the array is done.

//Php
$errors['success']   = false;
$errors['#errOne']   = "Enter a valid username";
$errors['#errTwo']   = "Enter a valid email";
$errors['#errThree'] = "Enter a valid password";
echo json_encode($errors);//

dataType:"json",
cache:false,
success: function(data){
for (i=1; i//I'm totally lost here.
//Output: "#errOne" "Enter a valid username" ->Loop thru remaining messages
}   
},

Answer

since your passing data as parameter, you can access the data

try something like this :

var $errors = {};
$errors['success']   = false;
$errors['#errOne']   = "Enter a valid username";
$errors['#errTwo']   = "Enter a valid email";
$errors['#errThree'] = "Enter a valid password";
    data : $errors;
    success: function(data){
    for (var i in data ){
       console.log(i + ':' + data[i]);
    }