var arr=[
{date:'3月21日',startTime:'08:30',endTime:'21:30'},
{date:'3月21日',startTime:'21:30',endTime:'08:30'},
{date:'3月22日',startTime:'08:30',endTime:'21:30'},
{date:'3月22日',startTime:'21:30',endTime:'08:30'},
{date:'3月23日',startTime:'08:30',endTime:'21:30'},
{date:'3月23日',startTime:'21:30',endTime:'08:30'},
]
希望生成
[
{ date: "3月21日", dayTime: "08:30-21:30", night: "21:30-08:30" },
{ date: "3月22日", dayTime: "08:30-21:30", night: "21:30-08:30" },
{ date: "3月23日", dayTime: "08:30-21:30", night: "21:30-08:30" },
]