JavaScript，如何使 fill() 成为变量（可以在自定义函数中使用）？

Question

I'm new to JS and have not found an answer to this question (or any question like it). I'm making a relatively simple program: create fish in tank and have them be of different lengths and colour.

I can make them different lengths through having a length variable in the parameters and editing the length argument within the function, but I do not think that same logic can be applied to custom adjustable colours in the same way*.

So in essence, how would I structure my code so that I can create the command fill() , a variable such that it can be edited to make different colours from the function call?

*EDIT: Apologies, I forgot to add code:

background(147, 226, 250);

var colour = fill(158, 52, 158); //Failed attempt at custom fill()

var drawFish = function(posX, posY, x) {

  ellipse(posX, posY, 166, 31);
  triangle(posX + 81, posY, posX + 125, posY - 16, posX + 125, posY + 16);
  ellipse(posX - 60, posY - 1, 10, 10);

};
drawFish(90, 241);
drawFish(121, 174);
drawFish(175, 356);
drawFish(238, 300);
drawFish(263, 22);

Answer 1

ANSWERED. I couldn't make fill() a variable of course but instead I created variables that would generate random numbers from 0 to 256(exclusive) and placed them inside the fill() function. This allowed me to generate different colours for my fish!

Thanks for the help.

Sample code:

var drawFish = function (posX, posY, tailSize) {
    
    stroke(74, 74, 74);
    var randomNum = random(0,256);
    var randomNum1 = random(0,256);
    var randomNum2 = random(0, 256);
    
    fill(randomNum, randomNum1, randomNum2); 
    var bodySize = random(150, 200);
    ellipse (posX, posY, 166,31); //body
    
    
    fill(randomNum1, randomNum, randomNum2);
    triangle (posX + 81, posY, posX + 125/20*tailSize, posY - 16/20*tailSize, posX + 125/20*tailSize, posY+16/20*tailSize); //tail
    
    //...(Removed code)
  
};