键盘事件只能处理ascii字符，并不能处理输入法相关的事件导致不能输入中文

怎么做才能支持输入法，进而能输入中文呢？

The issue is about handling IME (Input Method Editor) events for Chinese input in a WebAssembly/C++ context, likely using Emscripten. Research how Emscripten handles keyboard events and IME composition events in the browser. Look at the existing event handling code in the project, possibly in HTML5 or DOM interaction modules. Check for any existing IME support or composition event listeners. 'Done' means being able to input and commit Chinese characters through an IME in the WebAssembly application.

索引モデルが issue の本文から書いたものです。