SOURCE

'use strict';
var student ={
   age:19,
   name:"Curtain",
   likes:"girls",
   city:"zhengzhou"
  
};

for(var key in student){
	// alert (key);  
}


// alert("support");
var map = new Map();
var set = new Set();

map.set("Mike",93);
map.set("Mike2",94);
map.set("Mike3","hello");
// map.delete("Mike");
var isContain =map.has("Mike");
// alert(map.get("Mike3"));
// alert(isContain);
var a = [1,2,3,4,5,6,7,8,9];
//具iterable类型的集合可以通过新的for of循环进行遍历
for(var x of a){
  // alert(x);
}
a.forEach(function(b){
  alert(b);
});