Change animation speed in a script on Unity 5(JavaScript)

How can change the Legacy animation speed in a script on Unity 5.
I know Unity changed a little bit of coding. I am new on Unity 5.
In Unity 4 was animation[“animation name”].speed = 0.5;

private var anim : Animation;

function Awake () {

anim = GetComponent.<Animation>();
anim["animationName"].speed = 2.0;
	
}