Created
April 16, 2019 14:10
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JS Bin // source https://jsbin.com/kuzitob
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <meta charset="utf-8"> | |
| <meta name="viewport" content="width=device-width"> | |
| <title>Tasks and microtasks / Javascript event loop</title> | |
| </head> | |
| <body> | |
| <button id="btn">Click me</button> | |
| <div id="output"></div> | |
| <script id="jsbin-javascript"> | |
| const log = (msg) => { | |
| output.innerHTML += `<div>${msg}</div>`; | |
| }; | |
| btn.addEventListener('click', () => { | |
| Promise.resolve().then(() => { | |
| log('microtask 1'); | |
| Promise.resolve().then(() => { | |
| log('microtask 1.1'); | |
| }) | |
| }); | |
| setTimeout(() => log('task 1'), 0); | |
| log('click 1'); | |
| }) | |
| btn.addEventListener('click', () => { | |
| Promise.resolve().then(() => log('microtask 2')); | |
| setTimeout(() => log('task 2'), 0); | |
| log('click 2'); | |
| }) | |
| btn.click(); | |
| log('initial stack is empty'); | |
| </script> | |
| <script id="jsbin-source-javascript" type="text/javascript">const log = (msg) => { | |
| output.innerHTML += `<div>${msg}</div>`; | |
| }; | |
| btn.addEventListener('click', () => { | |
| Promise.resolve().then(() => { | |
| log('microtask 1'); | |
| Promise.resolve().then(() => { | |
| log('microtask 1.1'); | |
| }) | |
| }); | |
| setTimeout(() => log('task 1'), 0); | |
| log('click 1'); | |
| }) | |
| btn.addEventListener('click', () => { | |
| Promise.resolve().then(() => log('microtask 2')); | |
| setTimeout(() => log('task 2'), 0); | |
| log('click 2'); | |
| }) | |
| btn.click(); | |
| log('initial stack is empty');</script></body> | |
| </html> |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| const log = (msg) => { | |
| output.innerHTML += `<div>${msg}</div>`; | |
| }; | |
| btn.addEventListener('click', () => { | |
| Promise.resolve().then(() => { | |
| log('microtask 1'); | |
| Promise.resolve().then(() => { | |
| log('microtask 1.1'); | |
| }) | |
| }); | |
| setTimeout(() => log('task 1'), 0); | |
| log('click 1'); | |
| }) | |
| btn.addEventListener('click', () => { | |
| Promise.resolve().then(() => log('microtask 2')); | |
| setTimeout(() => log('task 2'), 0); | |
| log('click 2'); | |
| }) | |
| btn.click(); | |
| log('initial stack is empty'); |
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