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<!DOCTYPE html>
<html>
<head>
  <title>Using a constructor to set up common objects</title>
  <meta charset="utf-8">
  <script src="../assert.js"></script>
  <link rel="stylesheet" type="text/css" href="../assert.css">
</head>
<body>
	<script type="text/javascript">
    function Ninja() {
      this.skulk = function() {
        return this;
      };
    }

    var ninja1 = new Ninja();
    var ninja2 = new Ninja();

    assert(ninja1.skulk() === ninja1,
      "The 1st ninja is skulking");
    assert(ninja2.skulk() === ninja2,
      "The 2nd ninja is skulking");
	</script>
</body>
</html>

将函数作为构造函数进行调用是比较强大的一个特性