unity 功能扩展

using System.Collections;
using System.Collections.Generic;
using System.Runtime.CompilerServices;
using System.Threading.Tasks;
using UnityEngine;
using TMPro;
using UnityEngine.UI;

public static class ExtensionMethod
{
    public static TaskAwaiter GetAwaiter(this AsyncOperation asyncOperation)
    {
        var tcs = new TaskCompletionSource