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JavaScript 如何使用 setTimeout 实现 setInterval

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setIntervalSimulator

"use strict";

/**
 *
 * @author xgqfrms
 * @license MIT
 * @copyright xgqfrms
 * @created 2020-07-27
 * @modified
 *
 * @description setInterval
 * @difficulty Easy Medium Hard
 * @complexity O(n)
 * @augments
 * @example
 * @link https://developer.mozilla.org/en-US/docs/Web/API/WindowOrWorkerGlobalScope/setInterval
 * @solutions
 *
 */

const log = console.log;

const setIntervalSimulator = (callback, time, count = 10) => {
  function interval(callback, time) {
    const begin = new Date().getTime();
    const timerID = setTimeout(() => {
      clearTimeout(timerID);
      const end = new Date().getTime();
      log(`time =`, (end - begin) / 1000);
      // 排除 callback 执行时间的干扰
      callback();
      // 同步执行
      if(count) {
        log(`count =`, count);
        count--;
        interval(callback, time);
      }
    }, time);
  }
  // init
  interval(callback, time);
  // requestAnimationFrame();
}

// setIntervalSimulator(() => console.log(`OK`), 1000 * 10);
// setIntervalSimulator(() => console.log(`OK`), 1000 * 3);
// setIntervalSimulator(() => console.log(`OK`), 10);
setIntervalSimulator(() => console.log(`OK 1000`), 1000);
// setIntervalSimulator(() => console.log(`OK 0`), 0);



// time = 1.005
// OK 1000
// count = 10
// time = 1.002
// OK 1000
// count = 9
// time = 1.005
// OK 1000
// count = 8
// time = 1.003
// OK 1000
// count = 7
// time = 1.005
// OK 1000
// count = 6
// time = 1.002
// OK 1000
// count = 5
// time = 1.004
// OK 1000
// count = 4
// time = 1.004
// OK 1000
// count = 3
// time = 1.005
// OK 1000
// count = 2
// time = 1.005
// OK 1000
// count = 1
// time = 1.003
// OK 1000

setTimeoutSimulator

"use strict";

/**
 *
 * @author xgqfrms
 * @license MIT
 * @copyright xgqfrms
 * @created 2020-07-27
 * @modified
 *
 * @description setTimeout
 * @difficulty Easy Medium Hard
 * @complexity O(n)
 * @augments
 * @example
 * @link https://developer.mozilla.org/en-US/docs/Web/API/WindowOrWorkerGlobalScope/setTimeout
 * @solutions
 *
 */

const log = console.log;

const setTimeoutSimulator = (callback, time) => {
  const begin = new Date().getTime();
  // const begin = performance.now();
  // ReferenceError: performance is not defined
  const timerID = setInterval(() => {
    clearInterval(timerID);
    const end = new Date().getTime();
    // const end = performance.now();
    log(`time =`, (end - begin) / 1000);
    // 排除 callback 执行时间的干扰
    callback();
  }, time);
}

// setTimeoutSimulator(() => console.log(`OK`), 1000 * 10);
// setTimeoutSimulator(() => console.log(`OK`), 1000 * 3);
// setTimeoutSimulator(() => console.log(`OK`), 10);
setTimeoutSimulator(() => console.log(`OK 1000`), 1000);
setTimeoutSimulator(() => console.log(`OK 0`), 0);


// OK 0
// time = 0.006
// OK 1000
// time = 1.003

// OK 0
// time = 0.006
// OK 1000
// time = 1.006

// OK 0
// time = 0.007
// OK 1000
// time = 1.002

js 函数返回值， timoutID

https://www.cnblogs.com/xgqfrms/p/13388644.html

blank page

打印的是什么? event order id ?

Symbol

Symbol 实现原理, uuid

 key1 = Symbol(`key`);
// Symbol(key)
 key2 = Symbol(`key`);
// Symbol(key)

 key1 == key2;
// false
 key1 === key2;
// false

refs

https://javascript.info/settimeout-setinterval

https://developer.mozilla.org/en-US/docs/Web/API/WindowOrWorkerGlobalScope/setInterval

https://developer.mozilla.org/en-US/docs/Web/API/WindowOrWorkerGlobalScope/setTimeout

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