What is the difference between tolocal8bit and toutf8() in QT

take QString When a string is written to a file , I usually borrow QByteArray As an intermediate variable , There are two ways .
QString::toUtf8 It's output UTF-8 Coded character set
QString::toLatin1 Is equivalent to ASCii If the code does not contain Chinese, it will be converted to... By default ascii code 0x3f That's the character ’？‘
QString::Local8bit Is the character set encoding set by the local operating system , It's usually GB2312.
View the character set encoding set by the local operating system , start-up cmd , Input chcp,

The activity code page is 936, intend " China - Simplified Chinese (GB2312)"

QFile file("out.txt");
if (!file.open(QIODevice::WriteOnly | QIODevice::Text))
  	return;
QString msg = " ha-ha ";
QByteArray byte= msg.toLocal8Bit();
file.write(byte);
file.close();

ANSI code （American National Standards Institute）, In China, , It's understood here as GB2312 that will do