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April 8, 2020 09:55
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ES6 throttle debounce
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| <!DOCTYPE html> | |
| <html lang="en"> | |
| <head> | |
| <meta charset="UTF-8"> | |
| <meta name="viewport" content="width=device-width, initial-scale=1.0"> | |
| <title>Document</title> | |
| <style> | |
| body { height: 500vh; background: linear-gradient(to top, #051937, #004d7a, #008793, #00bf72, #a8eb12); } | |
| #debug { position: fixed; color: white; font-family: 'Menlo', monospace; font-size: 24px; bottom: 0; } | |
| </style> | |
| </head> | |
| <body> | |
| <div id="debug"> | |
| <p>scrollY : <span id="txt-scrollY">0</span></p> | |
| <p>window.innerWidth : <span id="txt-width">0</span></p> | |
| </div> | |
| <script src="index.js"></script> | |
| </body> | |
| </html> |
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| /** | |
| * cite: | |
| * Throttling and debouncing in JavaScript - codeburst | |
| * https://codeburst.io/throttling-and-debouncing-in-javascript-646d076d0a44 | |
| */ | |
| /** | |
| * 一定間隔で処理を間引くやつ | |
| * @param {Number} interval | |
| * @param {Function} fn | |
| */ | |
| const throttle = (interval, fn) => { | |
| let lastTime = performance.now() - interval; | |
| return (...args) => { | |
| const time = performance.now(); | |
| if (time - lastTime < interval) return; | |
| lastTime = time; | |
| fn(...args); | |
| } | |
| }; | |
| /** | |
| * 連続して発火するイベントの最後だけ発火させるやつ | |
| * @param {Number} delay | |
| * @param {Function} fn | |
| */ | |
| const debounce = (delay, fn) => { | |
| let timerId = null; | |
| return (...args) => { | |
| if (timerId) clearTimeout(timerId); | |
| timerId = setTimeout(() => { | |
| fn(...args); | |
| timerId = null; | |
| }, delay); | |
| }; | |
| }; | |
| class Page { | |
| constructor() { | |
| this.scrollYTextElement = document.getElementById('txt-scrollY'); | |
| this.scrollYTextElement.textContent = window.scrollY; | |
| this.widthTextElement = document.getElementById('txt-width'); | |
| this.widthTextElement.textContent = window.innerWidth; | |
| window.addEventListener('scroll', throttle(100, (e) => { this.onScroll(e); })); | |
| window.addEventListener('resize', debounce(100, (e) => { this.onResize(e); })); | |
| } | |
| onScroll(e) { | |
| // console.log(e.type, window.scrollY); | |
| this.scrollYTextElement.textContent = window.scrollY; | |
| } | |
| onResize(e) { | |
| // console.log(e.type, window.innerWidth); | |
| this.widthTextElement.textContent = window.innerWidth; | |
| } | |
| } | |
| document.addEventListener('DOMContentLoaded', () => { | |
| const page = new Page(); | |
| }); |
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