Input.GetButton 获取按钮

using UnityEngine;
using System.Collections;

public class example : MonoBehaviour {
	public GameObject projectile;
	public float fireRate = 0.5F;
	private float nextFire = 0.0F;
	void Update() {
		if (Input.GetButton("Fire1") && Time.time > nextFire) {
			nextFire = Time.time + fireRate;
			GameObject clone = Instantiate(projectile, transform.position, transform.rotation) as GameObject;
		}
	}
}

// Instantiates a projectile every 0.5 seconds,
// if the Fire1 button (default is Ctrl) is pressed.
//实例化一个抛射每隔0.5秒
//如果Fire1按钮（默认Ctrl）被按下

var projectile : GameObject;
var fireRate : float = 0.5;
private var nextFire : float = 0.0;
function Update () {
	if (Input.GetButton ("Fire1") && Time.time > nextFire) {
		nextFire = Time.time + fireRate;
		var clone : GameObject =
		Instantiate(projectile, transform.position, transform.rotation) as GameObject;
	}
}