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效果图

 安装codemirror依赖

本示例为Vue2项目，安装低版本的依赖

npm i codemirror@5.65.12
npm i vue-codemirror@4.0.6

实现

实现代码如下，里边涉及到的变量和函数自行替换即可，没有其他复杂逻辑。

<template><div class="picker"><div class="code-edit"><div class="top-title">公式</div><codemirrorref="codeEditor"v-model="formulaStr":options="cmOptions"@input="codeMirrorChange"></codemirror></div><el-buttonsize="mini"icon="el-icon-setting"@click="insertContent('表单4', 'variable')">添加变量</el-button><el-buttonsize="mini"icon="el-icon-setting"@click="insertContent('SUM', 'func')">添加函数</el-button></div></template><script>
import {codemirror} from "vue-codemirror";
import "codemirror/lib/codemirror.css";
import "codemirror/theme/idea.css";export default {components: {codemirror},data() {return {cmOptions: {// 语言及语法模式mode: 'text/javascript',// 主题theme: "idea",// 显示函数line: true,lineNumbers: false,// 软换行lineWrapping: true,// tab宽度tabSize: 4,},lang: 'javascript',formulaStr: "表单 表单1 * 表单11*表单12+SUM(1,2) AVG(99,21) IF()",};},computed: {editor() {return this.$refs.codeEditor.codemirror;}},mounted() {this.focus(this.formulaStr)this.autoMarkText()},methods: {codeMirrorChange() {//获取 editor 的内容console.log("content1: " + this.formulaStr);console.log("content2: " + JSON.stringify(this.editor.getValue()));},addFormula(content, type) {this.insertContent(content, type)},/*** editor 中的对内容进行处理* @param value* @param type variable | func，variable为表单变量，需标记，func 为函数，也需要做标记*/insertContent(value, type) {const from = this.editor.getCursor();if (type === 'variable') {this.editor.replaceSelection(value);const to = this.editor.getCursor();this.markText(from, to, value, 'cm-field');} else if (type === 'func') {this.editor.replaceSelection(`${value}()`);const to = this.editor.getCursor();this.markText(from, {line: to.line, ch: to.ch - 2}, value, 'cm-func');this.editor.setCursor({line: to.line, ch: to.ch - 1});} else if (typeof value === 'string') {this.editor.replaceSelection(value);}this.editor.focus();},autoMarkText() {if (this.formulaStr) {this.autoMark(this.formulaStr);this.focus(this.formulaStr);}},focus(value) {this.editor.setCursor({line: 0,ch: value ? value.length : 0});this.editor.focus()},markText(from, to, label, className) {if (className === void 0) {className = "cm-func";}let text = document.createElement("span");text.className = className;text.innerText = label;this.editor.markText(from, to, {atomic: true,replacedWith: text,});},/*** 解析 editor 的内容，分别对表单变量和函数进行标记*/autoMark() {const editor = this.editor;const lines = editor.lineCount();for (let line = 0; line < lines; line++) {const content = editor.getLine(line);// 标记函数调用,匹配一个或多个连续的大写字母，后面可以有任意数量的空白字符，再紧跟一个左括号content.replace(/([A-Z]+)\s*\(/g, (_, func, pos) => {this.markText({line: line, ch: pos}, {line: line, ch: pos + func.length}, func, 'cm-func');return _;});// 标记表单变量,这应该是动态获取，自行替换即可let vars = ["表单", "表单1", "表单11", "表单12"];vars.forEach(v => {let from = 0;let idx = -1;while (~(idx = content.indexOf(v, from))) {this.markText({line: line, ch: idx}, {line: line, ch: idx + v.length}, v, 'cm-field');from = idx + v.length;}});}},},
};
</script><style lang="less" scoped>
.picker {height: 525px;text-align: left;width: 50%;margin: 0 auto;.code-edit {height: 240px;border-radius: 6px;border: 1px solid #e8e9eb;}
}
.top-title {background-color: #fafafa;height: 30px;vertical-align: center;line-height: 30px;padding-left: 10px;border-radius: 4px 4px 0 0;border-bottom: none;
}
/deep/ .CodeMirror {height: 200px !important;/*表单变量样式*/.cm-field {background: #007bff;padding: 3px 5px;border-radius: 3px;color: #fff;margin: 0 1px;}/*函数样式*/.cm-func {font-weight: bold;color: #ae4597;line-height: 14px;margin: 0 1px;padding: 0 2px;}.CodeMirror-scroll {width: 100%;}
}</style>