My javascript is returning this error: $.ajax is not a function

Not sure what's wrong but I'm getting this error from my chrome console:

jquery-3.2.1.slim.min.js:1244 jQuery.Deferred exception: $.ajax is not a function TypeError: $.ajax is not a function
    at HTMLDocument.<anonymous> (file:///C:/Users/Adam/Desktop/UseTime/js/example.js:3:7)
    at j (file:///C:/Users/Adam/Desktop/UseTime/js/jquery-3.2.1.slim.min.js:1193:55)
    at k (file:///C:/Users/Adam/Desktop/UseTime/js/jquery-3.2.1.slim.min.js:1199:45) undefined
r.Deferred.exceptionHook @ jquery-3.2.1.slim.min.js:1244
jquery-3.2.1.slim.min.js:1247 Uncaught TypeError: $.ajax is not a function
    at HTMLDocument.<anonymous> (example.js:3)
    at j (jquery-3.2.1.slim.min.js:1193)
    at k (jquery-3.2.1.slim.min.js:1199)

From this JavaScript:

$(function() { //when the DOM is ready
    var times; //declare global variable
    $.ajax({ //set up request
        beforeSend: function (xhr) { //before requesting data
            if (xhr.overrideMimeType) { //if supported
                xhr.overrideMimeType("application/json"); // set MIME to prevent errors
            }
        }
    });
    //funciton that collect data from the json file
    function loadTimetable() { //decalre function
        $.getJSON('data/example.json') //try to collect json data
            .done(function (data) { //if succesful
                times = data; //store in variable
            }).fail(function () { //if a problem: show message
                $('#event').html('Sorry! we couldnt load your time table at the moment');
            });
    }
    loadTimetable(); //call the function

    //CLICK ON TEH EVENT TO LOAD A TIME TABLE
    $('#content').on('click', '#event a', function (e) { //user clicks on place
        e.preventDefault(); //prevent loading page
        var loc = this.id.toUpperCase(); //get value of id attr
        var newContent = "";
        for (var i = 0; i < times[loc].length; i++) { // loop through sessions
            newContent += '<li><span class = "time">' + times[loc][i].time + '</span>';
            newContent += '<a href = "descriptions.html#';
            newContent += times[loc][i].title.replace(/ /g, '-') + '">';
            newContent += times[loc][i].title + '</a></li>';
        }
        $('#sessions').html('<ul>' + newContent + '</ul>'); // Display Time
        $('#event a.current').removeClass('current'); // update selected link
        $(this).addClass('current');
        $('#details').text('');
    });

    //CLICK ON A SESSION TO LEAD THE DESCRIPTION
    $('#content').on('click', '#sessions li a', function (e) { //click on session
        e.preventDefault(); // prevent loading
        var fragment = this.href; //title is in href
        fragment = fragment.replace('#', ' #'); //Add Space before #
        $('#details').load(fragment); //to load info
        $('#sessions a.current').removeClass('current'); //update selected
    });

    //CLICK ON PRIMARY NAVIGATION
    $('nav a').on('click', function (e) { //click on nav
        e.preventDefault(); //prevent loading
        var url = this.href; //get UR: to load
        $('nav a.current').removeClass('current');
        $(this).addClass('current');
        $('#container').remove(); //remove old
        $('#content').load(url + ' #container').hide().fadeIn('slow'); // add new
    });
});

I'm not sure if it's an issue with the way I'm initiating .ajax or if my jquery isn't correctly implemented. I think it is. Any Thoughts?

edit: here's the html that goes with the script above

<!DOCTYPE html>

<body>
    <header>
        <h1>UseTime</h1>
        <nav>
            <a href="jq-load.html">HOME</a>
            <a href="jq-load.html2">PROFILE</a>
            <a href="jq-load.html4">MANAGE TASKS</a>
            <a href="usetime.html">TIME TABLE</a>
        </nav>
    </header>
    <section id="content">
        <div id="container">
            <div class="third">
                <div id="event">
                    <a id="class1" href="class1.html"><img src="" alt="class1" /> Class 1 </a>
                    <a id="class2" href="class2.html"><img src="" alt="class2" /> Class 2 </a>
                    <a id="class3" href="class3.html"><img src="" alt="class3" /> Class 3 </a>
                </div>
            </div>
            <div class="third">
                <div id="sessions"> Select a Class from the left </div>
            </div>
            <div class="third">
                <div id="details"> Details </div>
            </div>
        </div>
        <!-- container -->
    </section>
    <!-- content -->

    <script src="js/jquery-3.2.1.slim.min.js"></script>
    <script src="js/example.js"></script>
</body>

Answers:

Answer

You are using slim version of jQuery. It Doesn't support ajax Calling. Use

<script src="https://code.jquery.com/jquery-3.2.1.min.js"></script>

instead of it.

Slim build

Sometimes you don’t need ajax, or you prefer to use one of the many standalone libraries that focus on ajax requests. And often it is simpler to use a combination of CSS and class manipulation for all your web animations. Along with the regular version of jQuery that includes the ajax and effects modules, we’ve released a “slim” version that excludes these modules. All in all, it excludes ajax, effects, and currently deprecated code. The size of jQuery is very rarely a load performance concern these days, but the slim build is about 6k gzipped bytes smaller than the regular version – 23.6k vs 30k. These files are also available in the npm package and on the CDN:

https://code.jquery.com/jquery-3.1.1.slim.js
https://code.jquery.com/jquery-3.1.1.slim.min.js

Referred from jQuery Blog

Answer

jQuery 3 slim version doesn't support ajax.

According to the release docs,

Along with the regular version of jQuery that includes the ajax and effects modules, we’re releasing a “slim” version that excludes these modules. All in all, it excludes ajax, effects, and currently deprecated code.

To use .ajax method, simply use the full version one.

Try this one (jquery-3.2.1.min.js) instead of slim (jquery-3.2.1.slim.min.js)

  <script src="https://code.jquery.com/jquery-3.2.1.min.js"></script>

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