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var Duck = function () {
    this.color = 'yellow';
    this.quack = function () {
      alert('呱呱呱');
    };
  };
var DuckToy = new Duck();
DuckToy.play = function () {
  alert('玩玩具鸭子');
};

<a href="#" id="DuckColor">alert出Duck的color(通过DuckToy)</a>
<br>
<a href="#" id="DuckQuack">执行Duck的quack(通过DuckToy)</a>
<br>
<a href="#" id="DuckToyPlay">玩DuckToy</a>

<script>
	document.getElementById('DuckColor').onclick = function () {
    alert(DuckToy.color);
  };
  document.getElementById('DuckQuack').onclick = function () {
    DuckToy.quack();
  };
  document.getElementById('DuckToyPlay').onclick = function () {
    DuckToy.play();
  };
</script>