function to set random background color in javascript

1function generateRandomColor() {
2  var letters = '0123456789ABCDEF';
3  var color = '#';
4  for (var i = 0; i < 6; i++) {
5    color += letters[Math.floor(Math.random() * 16)];
6  }
7  return color;
8}
9
10var randomColor=generateRandomColor();//"#F10531"

1function get_random_color() 
2{
3    var color = "";
4    for(var i = 0; i < 3; i++) {
5        var sub = Math.floor(Math.random() * 256).toString(16);
6        color += (sub.length == 1 ? "0" + sub : sub);
7    }
8    return "#" + color;
9}
10
11function get_rand_color()
12{
13    var color = Math.floor(Math.random() * Math.pow(256, 3)).toString(16);
14    while(color.length < 6) {
15        color = "0" + color;
16    }
17    return "#" + color;
18}
19

1function random(number){
2    return Math.floor(Math.random()*number);;
3}
4function randomColor(){
5 return 'rgb('+random(255)+','+random(255)+','+random(255)+')';    
6}

1function random(number){
2    return Math.floor(Math.random()*number);;
3}
4function randomColor(){
5 return 'rgb('+random(255)+','+random(255)+','+random(255)+')';    
6}
7function setRandomColor(){
8    var clr_val=randomColor();
9   // headings.style.color=randomColor();
10    document.body.style.backgroundColor=clr_val;
11
12}
13var btn=document.getElementById("btn");
14btn.addEventListener("click",setRandomColor);