If this Key is pressed do this animation

Hello, tinashee, you can use animation.CrossFade, here is the code:

JS:

 var player : GameObject;
 
 function Update()
 {
     if(Input.GetKeyDown(KeyCode.W))
     {
         player.animation.CrossFade("Walk");
     }
 
     if(!Input.anyKey)
     {
         player.animation.CrossFade("Idle");
     }
 }

C#

    public GameObject player;
     
     void Update()
     {
         if(Input.GetKeyDown(KeyCode.W))
         {
             player.animation.CrossFade("Walk");
         }
     
         if(!Input.anyKey)
         {
             player.animation.CrossFade("Idle");
         }
     }