看一看下面这段帮助你就会明白啦!property MDIChildren[I: Integer]: TForm;DescriptionUse MDIChildren to access a child form. I is the index of the child form to access. The order of MDI children changes as different MDI forms are activated. Initially, forms are listed in creation order, with new forms being added to the end of the array. Whenever an MDI child is activated, however, it moves to the front of the list. Thus, use I to index over all forms in the array, but not to refer to a specific form.
thanks for prometheusphinx's opinion!!!! I got it!!
I got it!!