积木——“当背景换成( )”
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先修科目
说明
积木“当背景换成( )”是事件类别中的帽子积木。当且仅当背景换成选定的背景，它才会运行它下面连接的积木。
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注意：这个积木本身不能更换背景。如果想知道如何更换背景，请参考这篇文章。
演示
在这个程序中，每当点击绿旗，我们就把背景换成列表中的下一个背景。只有当背景变为“创益编程”，这两个角色就分别向左转、向右转。
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