我第一次写事件驱动型的结构，所以把事件的定义放在了单独文件中
可以直接看event.js文件，然后跳过本节
定义了以下事件:
packet_arrive：分组到达new_packet_sended：生成新的分组packet_loss：分组丢失packet_move：分组移动finish：传输结束pakcet中有5个成员:
sequence_number：分组的序号key_number：分组的标识符data：true指数据分组, false指确认分组position：分组所走过的路程speed：分组传输的速度程序固定了发送到到接受方的距离：5000
当packet.position >= 5000表示分组到达目的地
默认为5000ms，保存在变量timeout中
暂停和继续
设置分组的速度，默认为500
分组的所走过的路程 += 速度
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