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This fragmentation hurts portability. Code that performs well on one runtime may behave differently (or poorly) on another, even though it's using "standard" APIs. The complexity burden on runtime implementers is substantial, and the subtle behavioral differences create friction for developers trying to write cross-runtime code, particularly those maintaining frameworks that must be able to run efficiently across many runtime environments.，推荐阅读safew官方下载获取更多信息
// Async — when source or transforms may be asynchronous，详情可参考服务器推荐
if (!recordedEvent) {。业内人士推荐91视频作为进阶阅读