Answer 1

function changeToNormal(obj) {
    let newObj = {};
    let t = newObj;
    const keys = Object.keys(obj);
    for (key of keys) {
        const fArr = key.split('.');
        while (fArr.length) {
            const val = fArr.length === 1 ? entry[key] : {};
            const tmpKey = fArr.shift();
            t[tmpKey] = t[tmpKey] || val;
            t = t[tmpKey];
        }
        t = newObj;
    }
    return newObj;
}

Answer 2

WeakMap 中四个方法好实现么