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From: Ben Bacarisse <ben.usenet@bsb.me.uk>
Newsgroups: comp.lang.javascript
Subject: Re: Code for changing same colors on webpage to unique random colors after each webpage display change.
Date: Sat, 13 Feb 2021 12:18:38 +0000
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Jonas Thörnvall <jonas.thornvall@gmail.com> writes:

> function rndColor() {
>     var hex = ['0', '1', '2', '3', '4', '5', '6', '7',
>                '8', '9', 'A', 'B', 'C', 'D', 'E', 'F'],
>         color = '#', i;
>     for (i = 0; i < 6 ; i++) {
>         color = color + hex[Math.floor(Math.random() * 16)];
>     }
>     return color;
> }

Or you could use

  '#' + Math.floor((Math.random()*0x1000000)).toString(16).padStart(6, '0')

and, if you want to avoid padStart, (it's a recent addition):

  '#' + ('000000' + Math.floor((Math.random()*0x1000000)).toString(16)).slice(-6)

-- 
Ben.