javascript中的R，G，B

Question

How do you output every rgb color with javascript at the same time easily and quickly ? I have tried loops and nested loops but they were not what I needed.

var r, g, b;
for (r = o,r < 255,r++)
    console.log(r);

for (g = 0,g < 255,g++)
    console.log(g);

for (b = 0,b < 255,b++)
    console.log(b);

Answer 1

There are 256*256*256 or 16 million combinations in the 24 bit R,G,B color space. A Simple loop over all of them would be:

for(var r = 0; r < 256; r++) {
    for(var g = 0; g < 256; g++){
        for(var b = 0; b < 256; b++){
            console.log("("+r+","+g+","+b+")")
        }
    }
}

This will not be fast and at some point the browser will stop printing to the console.

Answer 2

First correction: Do a triple nested for loop so you can get all the combinations. (256 * 256 * 256)

Second correction: semicolons instead of commas inside for loop brackets. for (___; ____; ___) .

Third correction The upper bound value of each for loop should be 256 instead of 255 . That's because when you use < 255 , the variable will never take value equal to 255 , instead it will take maximum value 254. Therefore, use 256 to make it go upto 255 . (Maximum intensity count of each color channel).

var r, g, b;
for(r = 0; r < 256; r++) {
    for(g = 0; g < 256; g++) {
        for(b = 0; b < 256; b++) {
            console.log(r + " " + g + " " + b);
        }
    }
}