In the character encoding format option UTF-8 (no BOM) means

Bom:byte Order Mark
UTF-8 BOM is also called UTF-8 signature, in fact, UTF-8 BOM to UFT-8 has no effect, is to support utf-16,utf-32 to add the Bom,bom signature means to tell the editor what encoding the current file, convenient editor identification, But although the BOM does not appear in the editor, it produces output, just like a blank line

The difference between UTF8 and UTF8 +bom

http://gkecenter.blog.163.com/blog/static/18138030520129292491090/

In the character encoding format option UTF-8 (no BOM) means