Skip to content

Instantly share code, notes, and snippets.

@black-black-cat

black-black-cat/a.js

Last active July 13, 2019 07:23
Show Gist options
  • Save black-black-cat/bc6a89f8d5e6a1bc259a9c8160843677 to your computer and use it in GitHub Desktop.
Save black-black-cat/bc6a89f8d5e6a1bc259a9c8160843677 to your computer and use it in GitHub Desktop.
Download ZIP
rgb to hex, hex to rgb
Raw
a.js
const rgbToHex = (text) => {
let arr = text.split(/[^0-9.]+/).slice(1, -1)
let r = +arr[0]
let g = +arr[1]
let b = +arr[2]
let a = +arr[3]
let v = (r << 16) + (g << 8) + b
let hex = ('00000' + v.toString(16)).slice(-6)
return a == null ? hex : {hex, a}
}
const hexToRgb = (text) => {
if (text.length === 3 || text.length === 4) {
text = text.split('').map(char => char + char).join('')
}
let hexA = ''
let a = 1
let isRgba = text.length === 8
if (isRgba) {
hexA = text.slice(-2)
a = parseInt(hexA, 16) / 0xff
text = text.slice(0, 6)
}
let v = parseInt(text, 16) // base 10
let r = v & 0xff0000 >>> 16
let g = v & 0x00ff00 >>> 8
let b = v & 0x0000ff
if (isRgba) {
return `rgba(${[r, g, b, a].join(', ')})`
}
return `rgb(${[r, g, b].join(', ')})`
}
let rgb = 'rgb(200, 200, 200)'
// console.log(rgbToHex(rgb))
// console.log(hexToRgb(rgbToHex(rgb)) === rgb)
// console.log(hexToRgb('c8c8c8ee'))
// console.log(hexToRgb('333'))
console.log(hexToRgb('3333'))
Raw
index.html
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>GistRun</title>
<link rel="stylesheet" href="styles.css">
</head>
<body>
<h1>Hello world!</h1>
<script src="a.js"></script>
</body>
</html>
Raw
styles.css
/* todo: add styles */
Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment