var list = [
    {recipient: 'abccccccc', type: '0x2', amount: 1, time: '2019-07-04 09:00:00', flag: '加入'}, //加入委托
    {recipient: 'abccccccc', type: '0x3', amount: 0, time: '2019-07-04 09:01:00', flag: '退出'}, //退出委托
    {recipient: 'abccccccc', type: '0x2', amount: 2, time: '2019-07-04 09:02:00', flag: '加入'}, //加入委托
    {recipient: 'abccccccc', type: '0x3', amount: 0, time: '2019-07-04 09:03:00', flag: '退出'}, //退出委托
    {recipient: 'abccccccc', type: '0x2', amount: 3, time: '2019-07-04 09:04:00', flag: '加入'}, //加入委托
    {recipient: 'abccccccc', type: '0x3', amount: 0, time: '2019-07-04 09:05:00', flag: '退出'}, //退出委托
]

一顿操作后想要得到的数据结构

var list = [
    {recipient: 'abccccccc', type: '0x2', amount: 1, time: '2019-07-04 09:00:00', flag: '加入'}, //加入委托
    {recipient: 'abccccccc', type: '0x3', amount: 1, time: '2019-07-04 09:01:00', flag: '退出'}, //退出委托
    {recipient: 'abccccccc', type: '0x2', amount: 2, time: '2019-07-04 09:02:00', flag: '加入'}, //加入委托
    {recipient: 'abccccccc', type: '0x3', amount: 2, time: '2019-07-04 09:03:00', flag: '退出'}, //退出委托
    {recipient: 'abccccccc', type: '0x2', amount: 3, time: '2019-07-04 09:04:00', flag: '加入'}, //加入委托
    {recipient: 'abccccccc', type: '0x3', amount: 3, time: '2019-07-04 09:05:00', flag: '退出'}, //退出委托
]

这边要通过time字段的值，先后得到amount相对应的字段