At cursor selection释疑

关于这个命令我们在screen 程序中经常用到，但要注意，它可能当多个 Module...At cusor-selection... ... End Module存在时你有可能搞不清之间的关系

以下是对它的层次关系的详解：

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The call hierarchy of the different combinations is as follows:

• If a MODULE... AT CURSOR-SELECTION statement is executed that was combined with FIELD, a statement without FIELD is not executed.（如果程序中的AT CURSOR-SELECTION对应的Module结合了Filed，那么没带Filed开头的Module将不执行）
• If a statement using FIELD appears more than once for the same screen field <f>, only the first statement is executed. （多个Filed Module .. At cursor-selection出现时候，只有第一个会执行）
• If a statement without FIELD occurs more than once, only the last statement is executed（如果都没是 Module...At cursor-selection形式的，只有最后一个Module会执行，前面的统统不执行）.