问题
Per the docs, there are enums for .eml and .iCalendar item attachments. Will there be an enum for contact item attachments.
https://docs.microsoft.com/en-us/javascript/api/outlook/office.attachmentcontent?view=office-js#content
Right now, item attachments that represent contacts have an .iCalendar enum.
来源：https://stackoverflow.com/questions/56840438/for-item-attachments-that-represent-a-contact-vcf-will-there-be-a-correspond