<!DOCTYPE html>
<body style="background: white">
<div style="background: red">CTRL + 1: red</div>
<div style="background: green">SHIFT + 1: green</div>
<div style="background: yellow">CTRL + SHIFT + 1: yellow</div>
<div style="background: lightblue">ALT + 1: lightblue</div>
<div style="background: lightgreen">CTRL + ALT + 1: lightgreen</div>
<div style="background: silver">SHIFT + ALT + 1: silver</div>
<div style="background: magenta">CTRL + SHIFT + ALT + 1: magenta</div>
<script>
var colors = {};
colors[0x001] = 'red';
colors[0x010] = 'green';
colors[0x011] = 'yellow';
colors[0x100] = 'lightblue';
colors[0x101] = 'lightgreen';
colors[0x110] = 'silver';
colors[0x111] = 'magenta';
document.onkeydown = function(e) {
if (e.keyCode != 49) return;
var mask = 0;
if (e.ctrlKey) mask |= 0x001;
if (e.shiftKey) mask |= 0x010;
if (e.altKey) mask |= 0x100;
console.log(mask);
if (mask) {
document.body.style.backgroundColor = colors[mask];
}
e.preventDefault();
e.stopPropagation();
return false;
};
</script>