JavaScript（第6课）：数据类型--（iterator）

遍历数组

 var  arr=[1,5,9];
        for (let i of arr){
            console.log(i);
        }

遍历Map:

 var  map=new Map([["tom",100],["jack",90],["lucy",88]])
        for (let i of map){
            console.log(i);
        }

遍历Set

  var set =new Set([1,7,5]);
        for (let i of set){
            console.log(i);
        }