<pre class="shiki github-dark shaku"><code>/** * @param {Array&lt;any&gt;} promises - notice input might have non-Promises * @return {Promise&lt;any[]&gt;} */function all(promises) { // your code here if (!promises.length) { return Promise.resolve([]); } const res = []; let count = 0; return new Promise((resolve,reject) =&gt; { for(let i = 0; i&lt;promises.length; i++) { Promise.resolve(promises[i]).then((val) =&gt; { res[i] = val; count ++; if (count === promises.length) { resolve(res); } }).catch(err =&gt; { reject(err); }) } })}</code></pre>

注意边界条件和封装非promise值

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> The Promise.all() method takes an iterable of promises as an input, and returns a single Promise that resolves to an array of the results of the inp…