SOURCE

 let dataAll = [{
                        nickname: 'wwe',
                        banci1: '232',
                        jibeng: '23123213',
                        name: 'fsfsklf',
                        banci2: '23123',
                        Ua: 'q232',
                        addtime: '2020-02-27'
                    },
                    {
                        nickname: 'wwe',
                        banci1: '232',
                        jibeng: '23123213',
                        name: 'fsfsklf',
                        banci2: '23123',
                        Ua: 'q232',
                        addtime: '2020-02-27'
                    },
                    {
                        nickname: 'wwe',
                        banci1: '232',
                        jibeng: '23123213',
                        name: 'fsfsklf',
                        banci2: '23123',
                        Ua: 'q232',
                        addtime: '2020-03-24'
                    },
                    {
                        nickname: 'wwe',
                        banci1: '232',
                        jibeng: '23123213',
                        name: 'fsfsklf',
                        banci2: '23123',
                        Ua: 'q232',
                        addtime: '2020-04-27'
                    },
                    {
                        nickname: 'wwe',
                        banci1: '232',
                        jibeng: '23123213',
                        name: 'fsfsklf',
                        banci2: '23123',
                        Ua: 'q232',
                        addtime: '2020-04-27'
                    },
                    {
                        nickname: '232',
                        banci1: '3dsd',
                        jibeng: 'dswe',
                        name: 'gdg',
                        banci2: 'daewee',
                        Ua: 'fsf',
                        addtime: '2020-04-27'
                    }
                ];
//定义一个空数组
                let newArr = [];
               // let dataFinal = [];
                //通过forEach循环数组
                dataAll.forEach((item, i) => {
                    let index = -1;
                    //然后在跑到这里筛选 根据不同的时间放置不同的数组    some（）用来查找数组中是否存在某个值  如果存在 就return true
                    let isExists = newArr.some((newItem, j) => {
                        if(item.addtime == newItem.addtime) {
                            index = j;
                            return true;
                        }
                    })
                    //代码是先跑这里的if条件判读  
                    if(!isExists) {
                        newArr.push({
                            addtime: item.addtime,
                            subList: [item]
                        })
                    } else {
                        newArr[index].subList.push(item);
                    }
                    
                })
//dataFinal = newArr;
                console.log(newArr);