Node.js定时器测试代码

timer1.js

// 高精度定时器，interval为毫秒
function myTimer(callback, interval) {
  function getTime() {
    return process.uptime() * 1000;
  }
  let previous = getTime();
  setInterval(function() {
    const now = getTime();
    if (now - previous >= interval) {
      previous = now;
      callback();
    }
  }, 0);
}

// 开始测试
function test() {
  let previous = process.uptime();
  myTimer(function() {
    const now = process.uptime();
    console.log(now - previous);
    previous = now;
  }, 1000);
}
test();

timer2.js

let p = process.uptime();
setInterval(function() {
  const n = process.uptime();
  console.log(n - p);
  p = n;
}, 1000);