双击加速

using UnityEngine;
using System.Collections;
public class cs: MonoBehaviour {
    public int dblclick_time;   //记录时间差
    public System.DateTime currentTime1=new System.DateTime();
    public int w1;       //用来加速的值
    void Start () {
        w1=1;
    }

    // Update is called once per frame
    void Update () {
        if(Input.GetKey(KeyCode.W))
        {
            transform.Translate(Vector3.forward * (5+w1)*Time.deltaTime, Space.Self);
        }
        if(Input.GetKey(KeyCode.S))
        {
            transform.Translate(Vector3.forward * -(5+w1)*Time.deltaTime, Space.Self);
        }
        if(Input.GetKey(KeyCode.A))
        {
            transform.Translate(Vector3.right * -(5+w1)*Time.deltaTime, Space.Self);
        }
        if(Input.GetKey(KeyCode.D))
        {
            transform.Translate(Vector3.right* (5+w1)*Time.deltaTime, Space.Self);
        }

        if(Input.GetKeyDown(KeyCode.W)||Input.GetKeyDown(KeyCode.S)||Input.GetKeyDown(KeyCode.A)||Input.GetKeyDown(KeyCode.D))
        {
            w1=1;
            currentTime1=System.DateTime.Now;   //保存按下按钮时候的时间
            dblclick_time++;
            if(dblclick_time<2&&dblclick_time>0)
            {
                w1=20;
            }
        }
        System.DateTime currentTime=new System.DateTime();
        currentTime=System.DateTime.Now;   //系统当前时间
        dblclick_time=(currentTime.Second-currentTime1.Second);
    }
}