提交是一组规则，它定义提交什么表单数据、如何提交数据以及数据提交的位置。
A submission is a set of rules that defines which form data is submitted, how the data is submitted, and where the data goes. Workplace Forms supports two types of submissions.
每个表单和控制项都会显露一组可经由程序设计以预先定义的事件。
Each form and control exposes a predefined set of events that you can program against.
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