es6 语法 （map、set和obj 的对比）

//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);//{};{};{}

}