【整理】【JS】map的基本操作

 

// 1、定义
var map = {1: "a", 2: "b", c: "3"};
// 2、遍历
for (key in map) {
  console.log(key + ":" + map[key]);
}
console.log("=================添加===================");
// 3、添加
map["d"] = "ee";
for (key in map) {
  console.log(key + ":" + map[key]);
}
console.log("=================替换===================");
// 4、替换
map["c"] = "444";
for (key in map) {
  console.log(key + ":" + map[key]);
}
console.log("=================删除===================");
// 5、删除
map.hasOwnProperty("1") ? delete map["1"] : 0;
for (key in map) {
  console.log(key + ":" + map[key]);
}