JavaScript-Programs/javascript A Counter Example.html at main · prince4panwar/JavaScript-Programs · GitHub

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<!DOCTYPE html>
<html>

<body>

  <h2>JavaScript Getters and Setters</h2>

  <p>Perfect for creating counters:</p>

  <p id="demo"></p>

  <script>
    // Define an object
    var obj = { counter: 0 };

    // Define Setters and Getters
    Object.defineProperty(obj, "reset", {
      get: function () { this.counter = 0; }
    });
    Object.defineProperty(obj, "increment", {
      get: function () { this.counter++; }
    });
    Object.defineProperty(obj, "decrement", {
      get: function () { this.counter--; }
    });
    Object.defineProperty(obj, "add", {
      set: function (value) { this.counter += value; }
    });
    Object.defineProperty(obj, "subtract", {
      set: function (value) { this.counter -= value; }
    });

    // Play with counter:
    obj.reset;
    obj.add = 5;
    obj.subtract = 1;
    obj.increment;
    obj.decrement;
    document.getElementById("demo").innerHTML = obj.counter;
  </script>

</body>

</html>