写一下我对后面两个手撕的思路： 第一题： function muiltiRequest(urls,maxNum) { return new Promise((resolve,rejcet) => { let cur = 0,finished = 0,res = [],_urls = [...urls]; function add() { if(_urls.length !== 0 && cur < maxNum) { cur++; let temp = _urls.shift(); axious.get(temp).then((data) => { res[urls.indexOf(temp)] = data; finished++; if(finished === urls.length) { resolve(res); } cur--; if(cur < maxNum) { add(); } }) .catch((err) => { rejcet(err); }); add(); } } add(); }); }