map的应用笔记

map往数组中添加元素

// 原数组
let list = [
{code:'hospitalA',name:'医院A'},
{code:'hospitalB',name:'医院B'}
]
// 往数组中追加元素
const newList = list.map(it => ({
	...it,
	children: []
}));
// 执行后
list = [
	{code:'hospitalA',name:'医院A',children:[]},
	{code:'hospitalB',name:'医院B'},children:[]
	]