ts 对数组分组

    public sortClass(sortData: any[]): any {
        const groupBy = (array: IFormData[], f: any) => {
            const groups: {
                [key: string]: IFormData[];
            } = {};
            array.forEach((item) => {
                const group = JSON.stringify(f(item));
                groups[group] = groups[group] || [];
                groups[group].push(item);
            });
            return Object.keys(groups).map((group) => {
                return groups[group];
            });
        };
        const sorted = groupBy(sortData, (item: IFormData) => {
            return item.element_group;
        });
        return sorted;
    }

// 分组前
console.log(listData);
// 分组后
console.log(sortClass(listData));