<pre class="shiki github-dark shaku"><code>/** * @param {() =&gt; Promise&lt;any&gt;} func * @param {number} max * @return {Promise} */function throttlePromises(funcs, max){ // your code here return new Promise((resolve,reject) =&gt; { if (funcs.length === 0) { resolve([]) } let index = 0; let running = 0; let completeCount = 0; const res =[]; const runNext = () =&gt; { if (index === funcs.length || running &gt;= max) { return; } const i = index; const task = funcs[i]; running++; index++; task().then(val =&gt; { res[i] = val; running--; completeCount++; if (completeCount === funcs.length) { resolve(res); } runNext(); }).catch(reject); runNext(); } runNext(); })}</code></pre>

1. 注意边界条件 2.利用闭包拿到运行的任务那一刻的index，从而存储对应的响应 3.用count记录已经完成的promise 4. 用running记录正在执行的任务

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Say you need to fetch some data through 100 APIs, and as soon as possible. If you use Promise.all(), 100 requests go to your server at the same time, …