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封装私有变量

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<!DOCTYPE html>
<html>

<head>
  <title>Using closures to approximate private variable</title>
  <meta charset="utf-8">
  <script src="../assert.js"></script>
  <link rel="stylesheet" type="text/css" href="../assert.css">
</head>

<body>
	<script>
    function Ninja() {
      var feints = 0;
      this.getFeints = function(){
        return feints;
      };
      this.feint = function(){
        feints++;
      };
     }

     var ninja1 = new Ninja();
     ninja1.feint();

     assert(ninja1.feints === undefined,
            "And the private data is inaccessible to us.");
     assert(ninja1.getFeints() === 1,
           "We're able to access the internal feint count.");


     var ninja2 = new Ninja();
     assert(ninja2.getFeints() === 0,
            "The second ninja object gets it’s own feints variable.");
	</script>
</body>
</html>