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<head>
  <meta charset="utf-8">
  <title>then() vs done()</title>
</head>
<body>
  <h1>then() vs done()</h1>
  <pre id="out"></pre>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    (function () {
      var lines = [];
      var dfdA = $.Deferred().resolve(3);
      var dfdB = $.Deferred().resolve(3);

      dfdA.done(function (n) {
        return n + 7;
      }).done(function (n) {
        lines.push("done chain: " + n);
      });

      dfdB.then(function (n) {
        return n + 7;
      }).then(function (n) {
        lines.push("then chain: " + n);
        document.getElementById("out").textContent = lines.join("\n");
      });
    })();
  </script>
</body>
</html>

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jQuery deferred.then() — vs done() (Try It)