<pre class="shiki github-dark shaku"><code>/** * @param {() =&gt; Promise&lt;any&gt;} func * @param {number} max * @return {Promise} */async function throttlePromises(funcs,max) { const returnArr = []; const executeArr = []; for (let func of funcs) { const returnFun = Promise.resolve().then(()=&gt;func()); returnArr.push(returnFun) if(max &lt;= funcs.length){ const executeFun = returnFun.then(() =&gt; executeArr.splice(executeArr.indexOf(executeFun),1)) executeArr.push(executeFun) if(executeArr.length &gt;= max){ await Promise.race(executeArr) } } } return Promise.all(returnArr)}</code></pre>

Simple solution(Promise.race() + Promise.all())

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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, …