unity 中的协程
//The coroutine will continue after all Update functionshave been calledon the next frame. yield return 1; //Continue after a specified time delay, after all Update functions have been called for the frame. yield return new WaitForSeconds(2); // Continue after all FixedUpdate has been called on all scripts. yield return new WaitForFixedUpdate(); // after a WWW download has completed yield return new WWW("url"); //Chains the coroutine, and will wait for the MyFunc coroutine to complete first. yield return StartCoroutine(LoadPic(urls));