``` Promise._race = promises => new Promise((resolve, reject) => { promises.forEach(promise => { promise.then(resolve, reject) }) }) ``` 基本和上面的例子差不多，不同點是每個傳入值使用Promise.resolve轉為Promise對象，兼容非Promise對象 ~~~js const _race = (p)=>{ return new Promise((resolve, reject)=>{ p.forEach((item)=>{ Promise.resolve(item).then(resolve, reject) }) }) } ~~~ ## 參考 [第 89 題：設計并實現 Promise.race()](https://github.com/Advanced-Frontend/Daily-Interview-Question/issues/140)