ASCII码对应表，很全

ASCII control characters (character code 0-31)

The first 32 characters in the ASCII-table are unprintable control codes and are used to control peripherals such as printers.

ASCII printable characters (character code 32-127)

Codes 32-127 are common for all the different variations of the ASCII table, they are called printable characters, represent

letters, digits, punctuation marks, and a few miscellaneous symbols. You will find almost every character on your keyboard.

Character 127 represents the command DEL.