Mocking Ajax requests

HTML

<h1>Mocking AJAX on jsfiddle</h1>

<div id="ajax"></div>

CSS

h1 {
  font-weight: bold;
  display: block;
  margin-bottom: 0.5em;
}

JavaScript

var jsonData = {
  "text1": "$('#ajax').append(data.text1)"
};

$.ajax({
  type: 'POST',
  dataType: 'json',
  url: '/echo/json/',
  data: {
    json: JSON.stringify(jsonData)
  },
  success: function(data) {
    var res = data.text1;
    eval(res);
  }
});

/* var jsonData = {
  "text1": "'a'+'b'"
};

$.ajax({
  type: 'POST',
  dataType: 'json',
  url: '/echo/json/',
  data: {
    json: JSON.stringify(jsonData)
  },
  success: function(data) {
    var res = data.text1;
    alert(res);
    var evaled = eval(res);
    alert(evaled);
  }
}); */