一個關於事件循環的題目

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var promises = [], ar, brfunction getNextEvent(){ return promises.shift()}promises.push(new Promise(function(r){ ar = r}),new Promise(function(r){ br = r})) document.addEventListener("touchstart", function(e){ ar(e) promises.push(new Promise(function(r){ ar = r }))})document.addEventListener("mousedown", function(e){ br(e) promises.push(new Promise(function(r){ br = r }))})const readFileAsync = async function () { while(promises.length){ let e = await getNextEvent() console.log(e.type) }}readFileAsync()

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