CodeMirror自定义关键词添加class

/**
	risk:['demo']  //自定义关键词数组
	eachLine //codeMirror遍历行
	cmOptions: { codeMirror options
      lineNumbers: true,
      matchBrackets: true,
      mode: this.scriptType,
      tabSize: 4,
      line: true,
      styleSelectedText: true,
    },
    content:'document.getElementById("demo").innerHTML=Date();'
**/
this.editor = CodeMirror.fromTextArea(this.$refs.mycode, this.cmOptions);
this.editor.setValue(this.content);
this.editor.eachLine((line) => {
  const risk = this.risk.includes(line.text);
  if (risk) {
    const getLine = this.editor.lineInfo(line).line;// 获取行号
    const getStart = line.text.indexOf() + 1;   // 获取起始位置
    const getEnd = getStart + line.text.length; // 获取结尾位置
    this.editor.markText({ line: getLine, ch: getStart }, { line: getLine, ch: getEnd }, { className: 'styled-background' });
  }
});