讨论系统 about onlinejudge HOT 1 CLOSED

先做个传入JSON输出发言结构的demo吧！！！
不采用时间戳，而是使用日期时间+时区的形式。因为2038年快来了（逃

讨论系统JSON结构：

[

         {
	  	"time":"2017/6/17 11:51:31 GMT+0800",
	  	"username":"root",
	  	"nickname":"根",
	  	"content":"太难了，出题人太强大了",
	  	"reply_to":"0"
	  },

	   {
	  	"time":"2017/6/17 11:51:50 GMT+0800",
	  	"username":"111",
	  	"nickname":"2333",
	  	"content":"说的对！！",
	  	"reply_to":"0"
	  },

	   {
	  	"time":"2017/6/18 12:51:50 GMT+0800",
	  	"username":"woc",
	  	"nickname":"",
	  	"content":"真的可怕!",
	  	"reply_to":"1"
	  },

	  {
	  	"time":"2017/6/19 12:51:50 GMT+0800",
	  	"username":"测试4",
	  	"nickname":"我啊啊啊",
	  	"content":"我都慌了",
	  	"reply_to":""
	  }
  

]

值得注意的是，JSON不允许任何不必要的逗号！

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