这是表单对象的名字。

This is the name of the form object.

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您可以手动对表单元素进行实例化并把它们连接到表单，或者让表单对象创建并实例化一个新表单元素，使它符合您要求的类型。

You can instantiate the form elements manually and attach them to the form or let the form object create and instantiate a new form element of the requested type for you.

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您可以只定义一次对象，然后在整个表单中引用这个对象。

You can define an object once and refer to the object throughout the form.

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