unity 动态播放音乐和音效

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class Sound : MonoSingleton<Sound>
{
    AudioSource m_Bg;//背景音乐
    AudioSource m_effect;//音效
    public string ResourcesDir = "";
    protected override void Awake()
    {
        base.Awake();
        m_Bg = gameObject.AddComponent<AudioSource>();//添加AudioSource组件
        m_Bg.playOnAwake = false;//先不播放
        m_Bg.loop = true;//循环播放
        m_effect = gameObject.AddComponent<AudioSource>();
    }
    //播放背景音乐
    public void PlayBG(string audioName)
    {        
        string oldName;
        if(m_Bg.clip == null)
        {
            oldName = "";
        }
        else
        {
            oldName = m_Bg.clip.name;
        }
        //判断是否正在播放
        if (oldName != audioName)
        {
            //加载资源 clip
            string path = ResourcesDir + "/" + audioName;
            AudioClip clip = Resources.Load<AudioClip>(path);
            //播放
            if(clip != null)
            {
                m_Bg.clip = clip;
                m_Bg.Play();
            }
        }
    }
    //播放音效
    public void PlayEffect(string audioName)
    {
        //加载资源 clip
        string path = ResourcesDir + "/" + audioName;
        AudioClip clip = Resources.Load<AudioClip>(path);
        //播放一次
        m_effect.PlayOneShot(clip);
    }
}