A difficulty here, however, is that the TransformStreamDefaultController does not have a ready promise mechanism like Writers do; so the TransformStream implementation would need to implement a polling mechanism to periodically check when controller.desiredSize becomes positive again.
// 易错点2：漏写stack.length判断 → 栈空时访问stack[-1]会报错
，更多细节参见91视频
“人民对美好生活的向往，就是我们的奋斗目标”
Faye Carruthers is joined by Suzy Wrack, Tom Garry and Jamie Spangher to review a dramatic FA Cup fifth round and look ahead to the upcoming Asian Cup and World Cup qualifiers