这位医学先驱或许从未想过，自己的脱发问题，会在数千年后的今天，催生出一个规模千亿的庞大市场。据不完全统计，已有超过3.38亿国人面临脱发困扰，相当于每4个国人中就有1人被脱发问题所困扰，且脱发人群还呈现出持续年轻化的鲜明趋势，越来越多的年轻人加入“防脱大军”。
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For our spreadsheet example, this step just generates a list of all dirty nodes, because every node (i.e. cell) is kind of an output node and an input node at the same time. In that case, you’d probably instead create a list of all nodes with no children. However, in a GUI framework, you might have “effect” nodes that are responsible for updating UI components — these are also leaves in the tree, but they’re specifically output leaves, because they form the observable part of our reactivity graph. This also means that an intermediate node that has no output won’t ever end up in this list, and therefore won’t get updated. This is something I’ll write about more in a follow-up post! ↩︎，更多细节参见新收录的资料