React+TypeScript项目中使用CodeMirror的步骤

npm install codemirror react-codemirror2 @types/codemirror

import React, { useRef, useEffect } from 'react';
import CodeMirror, { EditorFromTextArea } from 'codemirror';
import 'codemirror/lib/codemirror.css';
// 导入需要的语言模式和样式主题
import 'codemirror/mode/javascript/javascript';
import 'codemirror/mode/xml/xml';
import 'codemirror/mode/css/css';
import 'codemirror/mode/htmlmixed/htmlmixed';
import 'codemirror/theme/material.css';  // 加载的样式主题 https://codemirror.net/5/theme/
// 定义组件属性类型
interface CodeMirrorEditorProps {
  value: string;
  language: string;
  theme?: string;
  height?:Number;
  width?:Number;
  onChange: (value: string) => void;
  onShiftEnter?: () => void;
  onBlur?: (value: string) => void;
  onChangeLine?: () => void;
}
const CodeMirrorEditor: React.FC<CodeMirrorEditorProps> = (props) => {
  const { language } = props;
  const textareaRef = useRef<HTMLTextAreaElement>(null);
  const editorRef = useRef<EditorFromTextArea>();
  useEffect(() => {
    const textarea = textareaRef.current;
    if (!textarea) return;
    initCodeMirror();
    return () => {
      // 清理和销毁编辑器实例
      editorRef.current?.toTextArea();
    };
  }, []);
  const initCodeMirror = ()=>{
    const editorConfig = {
      tabSize: 2, // 制表符的宽度。默认为 4。
      fontSize: '16px', // 字体大小
      autoCloseBrackets: true, // 在键入时自动关闭括号和引号
      showCursorWhenSelecting: true, // 当选择处于活动状态时是否应绘制光标。默认为 false。这里设置成自动补全
      lineWrapping: true, // ，CodeMirror 是否应该滚动或换行。默认为false(滚动)。这里设置成换行
      lineNumbers: true, // 是否在编辑器左侧显示行号
      fullScreen: true, //当设置为 时true，将使编辑器全屏显示（如占据整个浏览器窗口）。
      mode:language, // 使用模式
      theme: 'material' // 编辑器样式的主题 必须确保.cm-s-[name] 加载定义相应样式的 CSS 文件。默认值为"default"，颜色包含在 中codemirror.css。可以一次使用多个主题类，例如将和类"foo bar"都分配给编辑器。cm-s-foocm-s-bar
    };
    editorRef.current = CodeMirror.fromTextArea(textareaRef.current!, editorConfig);
    // 监听编辑器内容变化事件
    editorRef.current.on('change', codemirrorValueChange);
    editorRef.current.on('keydown', keydown);
    editorRef.current.on('blur', blur);
     const { value, width, height } = props;
     editorRef.current.setValue(value || '');
     if (width || height) {
      editorRef.current.setSize(width, height);
     }
  }
  /** 失焦 */
  const  blur = (instance:any) => {
    if (props.onBlur) {
      props.onBlur(instance.doc.getValue());
    }
  };
  /** 键盘按键按下 */
  const keydown = (_:any, change:any) => {
    if (change.shiftKey === true && change.keyCode === 13) {
      if (props.onShiftEnter) {
        props.onShiftEnter();
      }
      change.preventDefault();
    }
  };
  /** 编辑内容变化 */
  const codemirrorValueChange = (doc:any, change:any) => {
    doc.eachLine((line:any) => {
      if(line.text.startsWith('//') || line.text.startsWith('#')) {
        doc.addLineClass(line, 'wrap', 'notes');
      } else if (line.wrapClass === 'notes') {
        doc.removeLineClass(line, 'wrap', 'notes');
      }
    });
    if (change.origin !== 'setValue') {
      if (props.onChange) {
        props.onChange(doc.getValue());
      }
    }
  };
  return (
    <textarea ref={textareaRef} />
  );
};
export default CodeMirrorEditor;

import React, { useState } from 'react';
import CodeMirrorEditor from 'CodeMirror';
const CodeEditor: React.FC = () => {
  const [code, setCode] = useState<string>('');
  const handleCodeChange = (value: string) => {
    setCode(value);
  };
  return (
    <div>
      <CodeMirrorEditor
        value=[code]
        language="javascript"
        onChange={handleCodeChange}
      />
      <pre>[code]</pre>
    </div>
  );
};
export default CodeEditor;

.CodeMirror {
  height: 300px;
}

// 注册JavaScript代码提示
const registerHelp = () =>{
	CodeMirror.registerHelper('hint', 'javascript', (editor, options) => {
	  const cursor = editor.getCursor();
	  const token = editor.getTokenAt(cursor);
	  const word = token.string;
	  // 假设你的关键字列表存储在keywords数组中
	  const keywords = ['if', 'else', 'for', 'while', 'function', 'class'];
	  const list = keywords.filter((keyword) => keyword.startsWith(word));
	  return {
	    list,
	    from: CodeMirror.Pos(cursor.line, token.start),
	    to: CodeMirror.Pos(cursor.line, token.end),
	  };
	});
}

useEffect(() => {
    const textarea = textareaRef.current;
    if (!textarea) return;
    registerHelp(); // 注册代码提示
    initCodeMirror();
    return () => {
      // 清理和销毁编辑器实例
      editorRef.current?.toTextArea();
    };
  }, []);

 /** 编辑内容变化 */
  const codemirrorValueChange = (doc:any, change:any) => {
    doc.eachLine((line:any) => {
      if(line.text.startsWith('//') || line.text.startsWith('#')) {
        doc.addLineClass(line, 'wrap', 'notes');
      } else if (line.wrapClass === 'notes') {
        doc.removeLineClass(line, 'wrap', 'notes');
      }
    });
	// 判断是输入择匹配出提示代码
	if (change.origin === '+input') {
      CodeMirror.commands.autocomplete(editor.current, undefined, {
        completeSingle: false,
      });
    }
    if (change.origin !== 'setValue') {
      if (props.onChange) {
        props.onChange(doc.getValue());
      }
    }
  };