Question

MDN 说明

Ensure that execution duration is shorter than interval frequency If there is a possibility that your logic could take longer to execute than the interval time, it is recommended that you recursively call a named function using setTimeout(). For example, if using setInterval() to poll a remote server every 5 seconds, network latency, an unresponsive server, and a host of other issues could prevent the request from completing in its allotted time. As such, you may find yourself with queued up XHR requests that won t necessarily return in order.

因此,一 4个样本

let start;
let count = 1;
setInterval(() => {
  let b = 0;
  for (let i = 0; i < 100000000; i++) {
    b += i;
  }
  if (!start) start = performance.now();
  else console.log((performance.now() - start) / count++);
}, 200);

let start;
let count = 1;
setInterval(() => {
  let b = 0;
  for (let i = 0; i < 100000000; i++) {
    b += i;
  }
  if (!start) start = performance.now();
  else console.log((performance.now() - start) / count++,b);
}, 200);

function mySetinterval(fn, timeout, ...args) {
  let timer;
  function loop() {
    timer = setTimeout(() => {
      fn(...args);
      loop();
    }, timeout);
  }
  loop();
  return function () {
    clearTimeout(timer);
    timer = null;
  };
}


let start;
let count = 1;
mySetinterval(() => {
  let b = 0;
  for (let i = 0; i < 100000000; i++) {
    b += i;
  }

  if (!start) start = performance.now();
  else console.log((performance.now() - start) / count++);
}, 200);

function mySetinterval(fn, timeout, ...args) {
  let timer;
  function loop() {
    timer = setTimeout(() => {
      fn(...args);
      loop();
    }, timeout);
  }
  loop();
  return function () {
    clearTimeout(timer);
    timer = null;
  };
}
let start;
let count = 1;
mySetinterval(() => {
  let b = 0;
  for (let i = 0; i < 100000000; i++) {
    b += i;
  }

  if (!start) start = performance.now();
  else console.log((performance.now() - start) / count++,b);
}, 200);

我认为, 平均实际执行所有法典,因此下游动物在200米后会发生。

和及时性将执行所有法典,而时段的缺口将可能与编码脱钩,即通过pu法进行估算。

是否正确? 而我不理解为什么国际发展部说XHR会影响Interval,你会举一个例子吗?

Answer 1

settimeout for XHR request

以上答复解释了为什么国家排雷局在间隔期使用XHR?

And I think setTimeout will perform better will in this siuation. blocking loop code will cause task has many macro task setInterval

let startTime = performance.now();
setInterval(() => {
  console.log(performance.now() - startTime);
  const count = Math.floor(10000000000 * Math.random());
  for (let i = 0; i < count; i++) {}
  startTime = performance.now();
}, 1000);

造成每一次休息时间间隔

友情链接