text: let context = {
  
  }
  
  // 用法示例
  // var o = {};
  // o.__defineGetter__('gimmeFive', function() { return 5; });
  // console.log(o.gimmeFive); // 5
  
  function defineGetter(property,key){
      context.__defineGetter__(key, function () {
          return this[property][key];
      })
  }
  
  function defineSetter(property,key){
      context.__defineSetter__(key,function(newValue){
          this[property][key] = newValue
      })
  }
  
  defineGetter('request','url');
  defineGetter('request','method');
  defineGetter('request','path');
  defineGetter('response','body');// 实现代理功能
  
  defineSetter('response','body');
  module.exports = context;