重复调用异步函数时，批量返回首次调用的结果

main.js

async function _getCgiData() {
  return new Promise(resolve => {
    setTimeout(() => {
      resolve('cgi data')
    }, 5000);
  })
}

let isGetting = false;
let getCgiQueue = []
async function getCgiData() {
  if (isGetting) {
    return new Promise(resolve => {
      getCgiQueue.push(resolve);
    })
  }
  isGetting = true;
  const res = await _getCgiData();
  getCgiQueue.forEach(resolve => {
    resolve(res);
  })
  getCgiQueue = [];
  isGetting = false;
  return res
}




async function main() {
  setTimeout(async () => {
    const res = await getCgiData();
    console.log(`res1`, res, new Date())
  }, 0);

  setTimeout(async () => {
    const res = await getCgiData();
    console.log(`res2`, res, new Date())

  }, 1000);

  setTimeout(async () => {
    const res = await getCgiData();
    console.log(`res3`, res, new Date())

  }, 2000);

  setTimeout(async () => {
    const res = await getCgiData();
    console.log(`res4`, res, new Date())
  }, 3000);

  setTimeout(async () => {
    const res = await getCgiData();
    console.log(`res5`, res, new Date())
  }, 6000);
}

main();