Unity3d - Input.GetKey returns true more than once

问题

I want to move my object on scene using keyboard inputs. To do this work, I create an empty game object and attach a .cs file to it. Code of this .cs file is below :

void Update()
{
     if (Input.GetKey ("up") ) {
         Debug.Log("up");
     }
     else if (Input.GetKey ("down") ) {
         Debug.Log("down");
     }
 }

I press up key only once, it writes output string on condole 7 times. Shouldn't I use this function to handle keyboard input?

回答1:

Please refer to http://docs.unity3d.com/ScriptReference/Input.GetKey.html

Returns true while the user holds down the key identified by name. Think auto fire.

If you look at the input class you can find other functions which will be more useful.

来源：https://stackoverflow.com/questions/30727530/unity3d-input-getkey-returns-true-more-than-once