新人求大神指点一个该怎么处理？？？？

原数据张这样

// 原数据
    let brr = [{date: "20190411"},
                {date: "20190412"},
                {date: "20190413"},
                {date: "20190412", o: 200},
                {date: "20190413", o: 300},
                {date: "20190411", m: 100},
                {date: "20190413", m: 300}]

我想处理成这样

//  目标数据
    let crr = [{
        date: "20190411", m: 100
    }, {
        date: "20190412", o: 200
    }, {
        date: "20190413", m: 300, o: 300
    }]

感谢各位大神抽空看一下