// 压入当前数，维持栈的递增特性
南方周末：你也说过，2015年17岁的你参加肖赛时，其实自己并没有准备好。如果现在的你可以给当时的自己一个建议，你会劝他不要参赛吗？
。爱思助手下载最新版本对此有专业解读
"cartId": "cart_abc123",
The problem compounds in pipelines. Each TransformStream adds another layer of promise machinery between source and sink. The spec doesn't define synchronous fast paths, so even when data is available immediately, the promise machinery still runs.
1. Sell before you build