调试——分步模式
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先修科目
积木按顺序排列
当你运行一个程序，所有积木按照其“顺序”执行。也就是说，所有积木按照在程序中的位置自顶向下一个个执行。
比方说，排在第1步的积木先执行，然后第2步的积木执行，以此类推。
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分步模式
理解积木顺序执行的最好办法就是用“分步模式”。在该模式中，积木每次只执行一个。
开启分步模式
点击桔色三角形
每次只运行一个积木，用绿色突出显示。
停止分步模式或退出分步模式
点击红色按钮
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