var arr1 = [
{ name: '鸣人', age: 16 },
{ name: '佐助', age: 17 }
];
新增选项money，值为520，不改变原数组值arr1
let a = arr1.map(item => {
return { ...item, money: 520 }
})
console.log(a)
console.log(arr1)
image.png
删除age属性，，不改变原数组值arr1
let a = arr1.map(item => {
const { age, ...rest } = item
// return rest
return { ...rest }
})
console.log(a)
console.log(arr1)
image.png
改age属性的值为999，不改变原数组值arr1
let a = arr1.map(item => {
return { ...item, age: 999 }
})
console.log(a)
console.log(arr1)
image.png
查name为[鸣人]，把他的年龄变成99，不改变原数组值arr1
let a = arr1.map(item => {
if (item.name == '鸣人') {
return { ...item, age: 999 }
}
return item
})
console.log(a)
console.log(arr1)
image.png
把属性age，变成agegege
let a = arr1.map(item => {
return { ...item, 'agegege': item['age'] }
}).map(item => {
const { age, ...rest } = item
return rest
})
console.log(a)
console.log(arr1)
image.png
