SOURCE

//map

// 创建一个set new Set();
//没有重复的

let map = new Map();
console.log(map);
map.set("zhang",123);
console.log(map.get('zhang'));
let foods = [];
let name ='';
let chef = {};
map.set(foods,['面包','起司']);
map.set(chef,{zhang:'zhang',kai:'kai'});
map.set(name,'张凯翔');

map.forEach(function(key,value,mapObj){
  console.log(key);
  console.log(value);
  console.log(mapObj);
});