Windows represents Unicode characters using UTF-16 encoding, in which each character is encoded as a 16-bit value. UTF-16 characters are called wide characters, to distinguish them from 8-bit ANSI characters.

Windows providing two parallel sets of APIs, one for ANSI strings and the other for Unicode strings. For example, there are two functions to displays a modal dialog box:

• MessageBoxA - takes an ANSI string.
• MessageBoxW - takes a Unicode string.

Javascript already uses UTF-16 internally - use charCodeAt() to get the values.