圖像來源，Getty Images
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.，详情可参考Line官方版本下载
。关于这个话题，safew官方版本下载提供了深入分析
代码重构：它没有直接甩代码，而是先思考了“设计模式”的选择（工厂模式 vs 策略模式），最终选择了适合扩展的策略模式。，详情可参考WPS官方版本下载
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