HTML5 - Beginners - Variables shortcut in function.html

<!DOCTYPE = html>
<html><body>
<canvas id="myCanvas" width="640" height="480" style="border:1px solid #d3d3d3;">
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</canvas>
<script>
var c=document.getElementById("myCanvas");
var ctx=c.getContext("2d");

var enemy = {
	x:10,
	y:10,
	w:32,
	h:32,
	color:'red',
};
var player = {
	x:100,
	y:100,
	w:32,
	h:32,
	color:'blue',
};

drawentity(player);
drawentity(enemy);

function drawentity(entity){
	ctx.fillStyle=entity.color;
	ctx.fillRect(entity.x,entity.y,entity.w,entity.h);
}

</script></body></html>