But that’s a lot of resetting! We can save a bunch of bandwidth by instead tracking the current foreground and background color in our renderer and only emitting a new color escape sequence when our desired color changes. This is an annoying amount of bookkeeping but it substantially cuts down on the amount of escape codes emitted.
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* 获取数字的第digit位（从右往左，0表示个位）
Google VP warns that two types of AI startups may not survive，这一点在91视频中也有详细论述
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