This function generates random hex colours. Useful for random HTML pages.

Hex Colour in 132 bytes (annotated).js

function()
{
  var l=["A","B","C","D","E","F",0,1,2,3,4,5,6,7,8,9],    // We declare our list with all the possible characters that can be used
      c="",                                               // Our variable we are going to use to store our final hex colour in
      i=0;                                                // The i variable we will use in our while loop
  while(i<6)                                              // Loop the code 6 times so that we get a 6-byte string (i.e. the hex colour)
  {
    c+=l[Math.floor(Math.random()*16)];                   // Get a random value from the list
    i++                                                   // Increment i by 1
  }
  return(c)                                               // Return the value to the user
}

Hex Colour in 132 bytes.js

function(){var l=["A","B","C","D","E","F",0,1,2,3,4,5,6,7,8,9],c="",i=0;while(i<6){c+=l[Math.floor(Math.random()*16)];i++}return(c)}