//数据结构对比 增查改删

{

    //map、set和Object

    let item = {t:1};

    let map = new Map();

    let set = new Set();

    let obj = {};

    //增

    map.set('t',1);

    set.add(item);

    obj['t'] = 1;

    console.info('map-set-obj',map,set,obj);//{"t" => 1};0:value:{t: 1};{t:1};

    //查

    console.info({

        map_exist:map.has('t'),

        set_exist:set.has(item),

        obj_exist:"t" in obj

    })//true true true

    //改

    map.set('t',2);

    item.t = 2;

    obj['t'] = 2;

    console.info('map-set-obj-modify',obj,map,set);//{t: 2};{"t"=>2};0:value:{t: 2}

    //删

    map.delete('t');

    set.delete(item);

    delete obj['t'];

    console.info('map-set-obj-empty',obj,map,set);//{};{};{}

}