C＃中的良好开源OCR [关闭](Good opensource OCR in C# [closed])

 您的协同功能正常工作。 问题是你正在从Update函数中调用它，并且它在一秒钟内被多次调用。 您可以使用boolean变量来检查协程函数是否正在运行。 如果它正在运行，则不要攻击或启动新的协程。 如果不是，那么你可以启动协程。 
 
 在协程函数结束时，将该变量设置为false 。 还有其他方法可以做到这一点，但这似乎是最简单的方法。 
 
bool isAttackingPlayer = false;
IEnumerator HarmPlayer()
{
    Debug.Log("Inside Harm Player");
    yield return new WaitForSeconds(5);
    Debug.Log("Player Health is the issue");
    isAttackingPlayer = false; //Done attacking. Set to false
}

void Update()
{

    transform.LookAt(target);
    float step = speed * Time.deltaTime;
    distance = (transform.position - target.position).magnitude;
    if (distance < 3.5)
    {
        if (isAttackingPlayer == false)
        {
            isAttackingPlayer = true; //Is attacking to true
            animator.SetFloat("Attack", 0.2f);
            StartCoroutine("HarmPlayer");
        }
    }
}

Your coroutine functions is working properly. The problem is that you are calling it from the Update function and it's being called many times in a second. You can use a boolean variable to check if the coroutine function is running. If it is running, don't attack or start new coroutine. If it is not, then you can start coroutine. 
 
At the end of the coroutine function set that variable to false. There other ways to do this but this seems to be the easiest way.
 
bool isAttackingPlayer = false;
IEnumerator HarmPlayer()
{
    Debug.Log("Inside Harm Player");
    yield return new WaitForSeconds(5);
    Debug.Log("Player Health is the issue");
    isAttackingPlayer = false; //Done attacking. Set to false
}

void Update()
{

    transform.LookAt(target);
    float step = speed * Time.deltaTime;
    distance = (transform.position - target.position).magnitude;
    if (distance < 3.5)
    {
        if (isAttackingPlayer == false)
        {
            isAttackingPlayer = true; //Is attacking to true
            animator.SetFloat("Attack", 0.2f);
            StartCoroutine("HarmPlayer");
        }
    }
}