《js事件循环机制》分享提问

Q1:答题者

Q2:下面代码的输出结果是（）console.log(1)new Promise((resolve, reject) = { console.log(2) resolve()}).then(res = { console.log(3)})console.log(4)

Q3:下面代码的输出结果是（）async function fn1() { console.log(1) await fn2() console.log(2)} async function fn2() { console.log(fn2)}fn1()console.log(3)

Q4:下面代码的输出结果是（）setTimeout(() = { console.log(a);});Promise.resolve().then(() = { console.log(b);}).then(() = { return Promise.resolve(c).then(data = { setTimeout(() = { console.log(d) }); console.log(f); return data; });}).then(data = { console.log(data);});