Js对map的操作

var map = {};
 
// 赋值
var key = "key1";
var value = "value1";
map[key] = value;
 
// 取值
alert(map[key]);
 
if("key1" in map) { //判断是否存在
    alert("OK");
}
 
// 删除
delete map["key1"];
 
// 遍历
for(key in map){
    console(key + map[key]);
}