For example:

function someName() {
 var result = this.getAllRecords();
    var data   = new Array();
    var test   = 13;

    alert(test);
    while(result.isValidRow()) {

        $.getJSON("http://test.url/?callback=?";,
        {
          TABLE_NAME:'BARCODE_CODES',
          RECORD_ID:  result.field(0), BARCODE_CODE: result.field(1),
          ITEM_COUNT: result.field(2), DATE_ADD:         result.field
(3)
        },
        function(json){
            var result   = json.error;
            var message  = json.message;
            var record   = json.data;
                 test     = 14;

            if(!result) {
                showWarning('RECORD_ID: ' + record + ' ' + message);
            } else {
                showError(message);
            }

        });

       result.next();
    }
    alert(test);
}
alert always show 13

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