Question

在Java中我们可以创建

private map<String, List<String>> map = HashMap<String, ArrayList<String>();

如何使用JavaScript中的键和值列表创建地图？

我想将密钥作为国家/地区名称，值列表是国家/地区状态。如何在JavaScript中使用？

Answer 1

map = {"country1": ["state1", "state2"], "country2": ["state1", "state2"]}

动态

var map = {};
map["country1"] = ["state1", "state2"];
map["country2"] = ["state1", "state2"];

Answer 2

这里有Java和JavaScript编码器。

//Variable map, contains a instance of Map with a constructor of String and Array of String.
let map = new Map([[String.prototype, [String.prototype]]]);

//Put values in map.
map.set('Country1', ['State1', 'State2']);
map.set('Country2', ['State1', 'State2', 'State3']);
map.set('CountryN', ['State1', 'State2', 'State3', 'StateN']);

//Iterate map and print the content of this.
map.forEach((value, key) => {
  console.log(`Country: ${key} States:[${value}]`);
});

如何在JavaScript中使用键和值列表创建映射

2 个答案: