Answer 1

function isUrl(url) {
       try {
           new URL(url);
           return true;
       }catch(err){
     return false;
}}

这个本来就是合法url

Answer 2

function flagObj(obj, key = '', res = {}) {
    if (typeof obj != 'object' || !obj) {
        res[key] = obj
    } else {
        for (let k in obj) {
            flagObj(obj[k], `${key ? key + '.' : key}${k}`, res)
        }
    }
    return res
}