"crash":[
  {
    //name:crash名称，callstack:方法调用队列，time:crash发生时间
    "name":"crashname1",
    "callstack":"callstack1",
    "time":12412454325
  },
  {
    "name":"crashname2",
    "callstack":"callstack2",
    "time":12412454325
  },
  {
    "name":"crashname3",
    "callstack":"callstack3",
    "time":12412454325
  }
]