JavaScript动态生成访问方法

    function Person(properties) {
        for (var item in properties) 
        {
         //必须放在匿名函数内分离作用域，不然每个p会是最后一项item的值
           (function (which) {
           //记住这个作用域内的值
            var p = item;
            which["Get" + p] = function () { return properties[p]; };
            which["Set" + p] = function (val) { properties[p] = val; };
           })(this);
        }
      }
      var user = new Person({ Name: "Bob", Age: 44});

      user.SetName("jack");
      user.SetAge(20);
     
      alert(user.GetName() + " " + user.GetAge());