SOURCE

// function jiecheng (n) {
//     sum = 1
//     for (let i = 1; i <= n; i++) {
//         sum = sum * i
//     }
//     return sum
// }
function jiecheng(n) {
    if (n === 1) return 1
    return n * jiecheng(n - 1)
}
console.log(jiecheng(3))
function feibo(n) {
    if (n === 1 || n === 2) return 1
    return feibo(n - 1) + feibo(n - 2)
}
console.log(feibo(10))
data = [
    {
        id: '1',
        name: 'scn',
        goods: [
            {
                id: '11',
                name: 'csc',
                goods:[
                    {
                        id:'125',
                        name: '12'
                    }
                ]
            },
            {
                id: '12',
                name: 'csc'
            }
        ]
    },
    {
        id: '2',
        name: 'csdvdc'
    }
]
function da(id, data) {
    id = id.toString()
    obj = {}
    data.forEach((item, index) => {
        if (item.id === id) {
            obj = data[index]
        } else if (item.goods && item.goods.length > 0) {
            da(id, item.goods)
        } else {
            return null
        }
    })
    return obj
}

console.log(da(125, data))
let obj1 ={
    id:1,
    d:2,
    msk: {
        jk:1,
        sc:2
    }
}
let obj2 = {...obj1}
obj1.id = 5
console.log(obj1, obj2)