Map转为数组
const map = new Map(); map.set(1,"foo").set(2,"bar").set(3,"baz"); const arr = [...map];//转数组方法1 Array.from(map);//转数组方法2 console.log(arr);
数组 转为 Map
const arr = ["foo","bar","baz"]; const arrChangeMap = (arr) => new Map(arr.map( (value,key) => [key,value])); console.log(arrChangeMap(arr));
Map 转为对象
const map = new Map(); map.set(1,"foo").set(2,"bar").set(3,"baz"); const mapChangeObj = (map) => { let obj = {}; for(let [k,v] of map) { obj[k] = v; } return obj; } console.log(mapChangeObj(map));
对象转为 Map
const obj = { "1" : "foo", "2": "bar", "3" : "baz", } const objChangeMap = (obj) => { let map = new Map(); for(let key in obj) { map.set(key,obj[key]); } return map; } console.log(objChangeMap(obj));
Map 转为 JSON
借助Map转对象
const map = new Map(); map.set(1,"foo").set(2,"bar").set(3,"baz"); const mapChangeJson = (map) => JSON.stringify(mapChangeObj(map)); console.log(mapChangeJson(map));
JSON 转为 Map
借助对象转Map
let json = '{"1":"foo","2":"bar","3":"baz"}'; const jsonChangeMap = (json) => objChangeMap(JSON.parse(json)); console.log(jsonChangeMap(json));