与一个方法将origin转化为tree，要求支持无限级和性能

const originToTree = (origin) => {    let tree = {}    for (let key in origin) {        if (key.includes('.')) { let keys = key.split('.') keys.reduce((pre, cur, index) => {     if (index === keys.length - 1) {         pre[cur] = origin[key]     } else {         if (pre[cur]) {  pre = pre[cur]         } else {  pre[cur] = {}  pre = pre[cur]         }     }     return pre }, tree)        } else { tree[key] = origin[key]        }    }    return tree}