只需在每个子网站的根目录下添加一个favicon.ico文件。

Just add a favicon.ico file at the root of each of your subsite.

ı想要更改标题栏图标而不是网址icon

ı want to change title bar icon not url icon

您应该可以通过编辑要使用的母版页来实现这一点

You should be able to achieve this by editing the master page to use