<li><a href="#newgame" onclick="yourAJAXFunction()" id="linknewgame">Jouer</a></li>

function yourAJAXFunction(){
  $.ajax({
       url: "http://localhost/api/pages/newgame",
       method: "GET",
       data: "token=3660935154fe3d7e9612466f6e70fbe6",
       dataType: 'json',
       success: function(json) {
            console.log(json);
            $("#response").append("<p><b>Page title: " + json.data.content+"</p>");
            },
             error: function(data) {
                 console.log("Error");
             }
    });
 }