function makeAsyncFunc(outputNum) {
return async function () {
const now = new Date().valueOf();
console.log(`${now}: this is ${outputNum}`);
};
}

const funcs = [];
for (let i = 1; i <= 10; i++) {
funcs.push(makeAsyncFunc(i));
}

function execOneByOne(asyncFuncs) {
if (asyncFuncs.length === 0) {
return;
}

const currentFunc = asyncFuncs.shift();
currentFunc().then(() => {
setTimeout(() => execOneByOne(asyncFuncs), 1000);
});
};

execOneByOne(funcs);

思路是把任务调度和任务执行区分开。