Mode-Changing Demo模式改变演示文档
On changes to the content of the above editor, a (crude) script tries to auto-detect the language used, and switches the editor to either JavaScript or Scheme mode based on that.在更改上述编辑器的内容时，（原始）脚本尝试自动检测所使用的语言，并基于此将编辑器切换为javascript或方案模式。