2025年03月01日 建站教程
Map是es6新增的一种方法，下面web建站小编就利用Map现在2个数组的合并及克隆！
let arr1 = [{name:'es6', year:'2022-10-10'},{name:'web', year:'2022-10-11'}]
let arr2 = [{name:'my', year:'2022-10-12'},{name:'php', year:'2022-10-15'}]
let arrMap1 = new Map([arr1]);
let arrMap2 = new Map([arr2]);
let merge = new Map([...arrMap1, ...arrMap2]);
console.log('输出结果：', merge)
输出结果：
Map(2) {{…} => {…}, {…} => {…}}
[[Entries]]
0: {Object => Object}
key: {name: 'es6', year: '2022-10-10'}
value: {name: 'web', year: '2022-10-11'}
1: {Object => Object}
key: {name: 'my', year: '2022-10-12'}
value: {name: 'php', year: '2022-10-15'}
size: 2
克隆数组
let arr1 = [{name:'es6', year:'2022-10-10'},{name:'web', year:'2022-10-11'}]
let arr2 = new Map([arr1]);
console.log(arr2);
//Map(1) {{…} => {…}}
//[[Entries]]
//0: {Object => Object}
//key: {name: 'es6', year: '2022-10-10'}
//value: {name: 'web', year: '2022-10-11'}
//size: 1
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