if (bufferAhead 15) {
Terminal applications have a “cursor” that they can move around, just like a text editor. You can tell that cursor “go to line 3, delete everything, then print out this new text” by using VT100 sequences. And you can use it to replace existing characters with new ones, without re-emitting a whole line.，推荐阅读Line官方版本下载获取更多信息
。关于这个话题，WPS官方版本下载提供了深入分析
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