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有人能告诉我如何制作一个简单的联系表格，只需一个编辑表格（我们称之为“名称”）就可以向 demo@mysite.com 发送电子邮件，然后验证表格是否有至少 10 个字符发送电子邮件和一个警告框显示“电子邮件发送！谢谢”？
谢谢！