test.html

<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=0" />
    <title>Test</title>
    <script type="text/javascript">
      function A() {
          this.x = 1;
          this.print = function() {
              console.log(this.x);
          }
      }
      
      // 创建一个空对象，并且 this 变量引用该对象，同时还继承了该函数的原型
      // 属性和方法被加入到 this 引用的对象中
      // 新创建的对象由 this 所引用，并且最后隐式的返回 this

      var a = new A();
      function newObject() {
        var obj = new Object();
        Constructor = [].shift.call(arguments);
        obj.__proto__ = Constructor.prototype;
        var temp = Constructor.apply(obj, arguments);
        return typeof temp === 'object' ? temp : obj;
      }

      
      var b = newObject(A)
      // var b = {};
      // b.construtor = A;
      // this.b = b;

      // a.__proto__ === A.prototype
      // 
      var print = a.print;
      print();

      var temp = {x: 2, print: print};
      temp.print();
    </script>
  </head>
  <body>

  </body>
</html>