不同子域名不同 https 证书 是否会冲突?

不会

If you have enabled wildcard ssl certificate to secure sub domains then different sub domain will not create an issue.

For example,

First Case :

If you will issue wildcard ssl certificate on *.xyz.com then it will secure :

contact.xyz.com
email.xyz.com
blog.xyz.com

Second Case :

If you will issue wildcard ssl certificate on *.get.xyz.com then it will secure :

contact.get.xyz.com
email.get.xyz.com
blog.get.xyz.com

@Williamp 感谢！ 明白了，我想第二个方案应该适用我的情况!
@ss098 感谢您的答复