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function sleep(d){
  for(var t = Date.now();Date.now() - t <= d;);
}

sleep(5000); //当前方法暂停5秒


function sleep(ms) {
  return new Promise(resolve => setTimeout(resolve, ms));
}

async function demo() {
  console.log('Taking a break...');
  await sleep(2000);
  console.log('Two second later');
}

demo();