unity [yield return null] and [yield return WaitForSecond]_yield return new waitforseconds(2f);

unity 协程

返回值IEnumerator
代码来自[company]

	IEnumerator _wait_one_frame_(System.Action onEntered, bool playEffects , bool blockScreen) {
		yield return null;
		//yield return new WaitForSeconds(2f);
		//yield return new WaitForEndOfFrame();

		InternalEnterScreen(onEntered, playEffects, blockScreen);	
	}
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yield return null;
代表下一帧执行，调用顺序在Update后，LateUpdate前

yield return WaitForEndOfFrame();
WaitForEndOfFrame会在一帧结束后调用，且在LateUpdate之后调用。

yield return new WaitForSeconds(2f);
代表2秒后执行

原文链接