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[null,"Choose(index, choice-1[, choice-2, ... [, choice-n]]) "]
[15,"Choose 会根据 index 的值来返回选择项列表中的某个值。如果 index 是 1，则 Choose 会返回列表中的第 1 个选择项。如果 index 是 2，则会返回列表中的第 2 个选择项，以此类推。     Index是必要参数，数值表达式或字段，它的运算结果是一个数值，且界于 1 和可选择的项目数之间。当 index小于 1 或大于列出的选择项数目时，Choose 函数返回 Null。如果 index 不是整数，则会先四舍五入为与其最接近的整数。"]
[]
[null,"窗体代码的查看，两种方法"]
[null,"1 工程资源管理器→窗体图标右击→查看代码；"]
[null,"2 窗体双击；"]