Trigger Animation Button

How can i trigger a animation with a button. The animation is called reload and the button i wanna trigger it with is r

Try this:

function Update () {
	if(Input.GetKeyDown("R")) {
		animation.Play("animationName");
	}
}

NOTE: this script is untested. By the way, please do not ask for complete scripts, but ask for specific questions on how to script this.