Not Ready json javascript and jquery [closed]

Question 1

Just make sure about this :

1)

 {
"Items": [
    {
        "local": "padaria",
        "item1": "leite",
        "item2": "pao"
    }],
}

you have comma after "]" (this you know :P) that makes parser doesn't parse JSON

2)

     for (var a = 0; a < getObjectLength(obj[0].Items[i]); a++) {
     if (a > 0) {
         t = (obj[0].Items[i].
             'item' + a);
     }

you got syntax error ==> obj[0].Items[i].'item'

you can not use someobj.'key' like this

you can use someobj["key"] or someobj.key

Question 2

There are a couple of problems with your code. I have fixed it in a Fiddle

The result of var obj = jQuery.parseJSON(retorno); was an object with one item "Items". This meant that subsequent calls to "Items" had to be done as either obj[0] or obj.Items or obj["Items"]

But you were doing it as:

for (var i = 0; i < obj[0].Items.length; i++) {

Which was basically trying and failing to find obj.Items.Items!

The next issue was the way you were trying to access sequentially named properties "item" + a. Because the name lookup generation was dynamic, the Object Named-Key notation was the correct way to access it

That code had to be converted to obj.Items[0].["item" + a]

Now for some good practices:

Your JSON has a trailing comma. Now although most browsers would parse it without any issues, older versions of IE will fail, and regardless, it is a bad practice.
Because objects, functions, variables, etc in Javascript are scoped within a Function, some of your original code was vulnerable to what is defined as a Hoisting/Scoping Issue. Function declarations should not be placed in blocks. Either use a function expression or move the statement to the top of the outer function.

So, the outer for() loop changes to either:
```
//Move outside, into the outermost block
function getObjectLength(obj) {
    //...
}
for (var i = 0; i < obj.Items.length; i++) {
    //...
}
```
Or
```
for (var i = 0; i < obj.Items.length; i++) {
    //Function Expression
    var getObjectLength = function (obj) {
        //...
    };

    //...
}
```
The problem with using the latter, Function Expression technique here is that it is a bad idea to create functions within a loop, as a new instance would be created on every iteration of the loop.

Fixed code:

var obj = jQuery.parseJSON(retorno);
for (var i = 0; i < obj.Items.length; i++) {
    function getObjectLength(obj) {
        var length = 0;
        for (var p in obj) {
            if (obj.hasOwnProperty(p)) {
                length++;
            }
        }
        return length;
    }
    var t;
    for (var a = 0; a < getObjectLength(obj.Items[i]); a++) {
        if (a > 0) {
            t = (obj.Items[i]['item' + a]);
        }
        console.log(obj.Items[i].t);
        console.log(t);
    };
    $("#thelist").append('<li>' + obj[0].Items[i].local + '</li>');
}