实现代码编辑并实时预览，我使用的是codemirror，以下是代码示例，直接上代码：

vueMain.vue （主页面，左侧为代码编辑区域，右侧为代码预览区域）

<template>
    <div :id="getRandomId" class="comp-home">

        <div class="online-comp-editor">
                <div class="demo-split-pane">
                    <!-- 代码 -->
                    <codemirror
                            class="left-box"
                            ref="myCodeMirror"
                            v-model="code"
                            :options="cmOptions"
                            @ready="onCmReady"
                    ></codemirror>
                </div>
            </div>
            <div slot="right" class="ol-right">
                <!-- 展示 -->
                <run-code
                        style="width: 100%;height: 100%;"
                        v-if="runCodeHash"
                        :code="code"
                        ref="runCodeComp"
                ></run-code>
            </div>
        </div>
    </div>
</template>

<script>

import runCode from "../components/runCode/runCode";
//code模版
import {codeList} from "../components/codeList/index";
//vue-codemirror相关
import {codemirror} from "vue-codemirror";
import "../components/codeMirror/index.js";
import "../components/codeMirror/myCodeMirror.css";
// 主题 theme style
import "codemirror/theme/base16-light.css";
import "codemirror/theme/base16-dark.css";

import {getuuid} from "@/utils/mUtils";
import fontIcon from "../../../../../../davp-gis/src/space/fontIcon.vue";
import customOnlineUpload from "../../custom/customOnlineUpload";
import api from 'davp-screen/src/service/getData';


export default {
    name: "vueRunning",
    components: {
        customOnlineUpload,
        fontIcon,
        runCode,
        codemirror
    },
    data() {
        return {
            split: 0.5,
            initCode: "",
            code: "",
            cmOptions: {
                mode: "vue",
                lineNumbers: true, //行号
                theme: 'base16-dark',// material
                autoCloseBrackets: true, //自动补全括号
                matchBrackets: true, //匹配括号
                showCursorWhenSelecting: true, //select显示光标
                autoCloseTags: true,
                tabSize: 4,
                foldGutter: true, //可折叠的块
                gutters: [
                    "CodeMirror-linenumbers",
                    "CodeMirror-foldgutter",
                    "CodeMirror-lint-markers"
                ],
                autofocus: true,
                styleActiveLine: true,
                hintOptions: {
                    completeSingle: false
                },
                keyMap: "sublime",
                extraKeys: {
                    "Ctrl-Q": "autocomplete"
                }
            },
            runCodeHash: true,
            cusOnlineForm: {
                cusCode: '',
                isPublish: '1',
                id: ''
            },
            btnFlag: 1,
        };
    },
    props: {
        cusData: {
            type: Object,
            default: {
                name: '',
                cusCode: '',
                id: '',
                remark: '',
                isPublish: ''
            }
        },
    },
    methods: {
        doSave() {
            // TODO 保存操作
        },
        run() {
            this.$refs.runCodeComp.destroyCode();
            this.$refs.runCodeComp.renderCode();
            this.$message.success("已运行");
        },
        reset() {
            this.$refs.runCodeComp.destroyCode();
            this.code = this.initCode;
            this.$nextTick(() => {
                this.$refs.runCodeComp.renderCode();
                this.$message.success("已重置");
            });
        },
        onCmReady(cm) {
            cm.on("keypress", () => {
                cm.showHint();
            });
        },
        getRandomId() {
            return getuuid;
        },
    },
    watch: {
        $route: {
            handler(val) {

            },
            immediate: true
        }
    },
    created() {
        //解决嵌套使用codemirror时，点击才会显示的问题。
        setTimeout(() => {
            this.$refs.myCodeMirror.codemirror.refresh();
        }, 100);
    },
    mounted() {
        this.$nextTick(() => {
            this.code = this.initCode = this.cusData.cusCode.length === 0 ? codeList['template'] : this.cusData.cusCode;
            this.cusOnlineForm.isPublish = this.cusData.isPublish;
            if (this.btnFlag === 2) {
                this.cusOnlineForm.id = this.cusData.id;
            }
            this.runCodeHash = false;
            this.$nextTick(() => {
                this.runCodeHash = true;
            });
        });
    }
};
</script>
<style scoped lang="scss">
@import 'davp-screen/src/style/mixin.scss';

.comp-home {
  width: 100%;
  height: 100%;
  box-sizing: border-box;

  .online-comp-editor {
    display: flex;
    height: 100%;
    width: 100%;

    .ol-left {
      width: 50%;
      height: 100%;
      padding: 0;
      box-sizing: border-box;
      border-right: 2px solid rgba(175, 171, 171, 0.17);
      border-left: 2px solid rgba(175, 171, 171, 0.17);
      border-bottom: 2px solid rgba(175, 171, 171, 0.17);

      .operator-btn {
        width: 100%;
        height: 50px;
        box-sizing: border-box;
        border-bottom: 2px solid rgba(175, 171, 171, 0.17);
        display: flex;
        flex-direction: row-reverse;
        flex-wrap: nowrap;
        align-items: center;
        position: relative;

        .cus-from {
          display: flex;
          flex-wrap: nowrap;
          align-content: center;
          align-items: center;
          height: 50px;
          margin-right: 20px;
          position: absolute;
          left: 10px;
        }

        /deep/ .el-button {
          margin: 0;
          margin-right: 20px;
          background-color: rgb(52, 52, 52);
          color: rgb(255, 255, 255);
          border-color: rgb(52, 52, 52);
        }

        /deep/ .el-button:hover, .el-button:focus {
          color: white;
          border-color: rgba(93, 93, 93, 0.88);
          background-color: rgba(93, 93, 93, 0.88);
        }
      }

      .demo-split-pane {
        width: 100%;
        height: calc(100%);
        //height: calc(100% - 50px);
        padding: 0;
      }
    }


    .ol-right {
      width: 50%;
      height: 100%;
    }
  }

}
</style>

runCode.vue（代码预览页面）

<template>
    <div :ref="'codeTemplate_' + cssId"></div>
</template>

<script>
import Vue from "vue";
import {getuuid} from "@/utils/mUtils";

export default {
    name: "runCode",
    data() {
        return {
            cssId: getuuid(),
            html: "",
            js: "",
            css: "",
            component: null
        };
    },
    props: {
        code: {
            type: String,
            default: ""
        },
        compId: {
            type: String,
            default: ""
        }
    },
    methods: {
        getSource(source, type) {
            const regex = new RegExp(`<${type}[^>]*>`);
            let openingTag = source.match(regex);

            if (!openingTag) {
                return "";
            } else {
                openingTag = openingTag[0];
            }

            return source.slice(
                source.indexOf(openingTag) + openingTag.length,
                source.lastIndexOf(`</${type}>`)
            );
        },
        //分割代码
        splitCode() {
            this.js = this.getSource(this.code, "script").replace(
                /export default/,
                "return "
            );
            this.css = this.getSource(this.code, "style");
            this.html = this.getSource(this.code, "template");
        },
        //挂载
        renderCode() {
            this.splitCode();

            if (this.html !== "" && this.js !== "") {
                const parseStrToFunc = new Function(this.js)();
                parseStrToFunc.template = this.html;

                const Component = Vue.extend(parseStrToFunc);
                this.component = new Component().$mount();

                this.$refs['codeTemplate_' + this.cssId].appendChild(this.component.$el);
                if (this.css !== "") {
                    const style = document.createElement("style");
                    style.type = "text/css";
                    style.id = this.cssId;
                    style.innerHTML = this.css;
                    document.getElementsByTagName("head")[0].appendChild(style);
                }
            }
        },
        destroyCode() {
            const $target = document.getElementById(this.cssId);
            if ($target) {
                $target.parentNode.removeChild($target);
            }

            if (this.component) {
                this.$refs['codeTemplate_' + this.cssId].removeChild(this.component.$el);
                this.component.$destroy();
                this.component = null;
            }
        }
    },
    mounted() {
        //挂载节点
        this.renderCode();
    },
    beforeDestroy() {
        this.destroyCode();
    }
};
</script>
<style scoped></style>

codeMirror文件夹下：

1、index.js

import 'codemirror/lib/codemirror.css'
// language
import 'codemirror/mode/vue/vue.js'
// theme css
import 'codemirror/theme/base16-dark.css'
// active-line.js
import 'codemirror/addon/selection/active-line.js'
// styleSelectedText
import 'codemirror/addon/selection/mark-selection.js'
import 'codemirror/addon/search/searchcursor.js'
// highlightSelectionMatches
import 'codemirror/addon/scroll/annotatescrollbar.js'
import 'codemirror/addon/search/matchesonscrollbar.js'
import 'codemirror/addon/search/searchcursor.js'
import 'codemirror/addon/search/match-highlighter.js'
// keyMap
import 'codemirror/mode/clike/clike.js'
import 'codemirror/addon/edit/matchbrackets.js'
import 'codemirror/addon/comment/comment.js'
import 'codemirror/addon/dialog/dialog.js'
import 'codemirror/addon/dialog/dialog.css'
import 'codemirror/addon/search/searchcursor.js'
import 'codemirror/addon/search/search.js'
import 'codemirror/keymap/sublime.js'
// foldGutter
import 'codemirror/addon/fold/foldgutter.css'
import 'codemirror/addon/fold/brace-fold.js'
import 'codemirror/addon/fold/comment-fold.js'
import 'codemirror/addon/fold/foldcode.js'
import 'codemirror/addon/fold/foldgutter.js'
import 'codemirror/addon/fold/indent-fold.js'
import 'codemirror/addon/fold/markdown-fold.js'
import 'codemirror/addon/fold/xml-fold.js'
//hint
import 'codemirror/addon/hint/javascript-hint'
import 'codemirror/addon/hint/html-hint'
import 'codemirror/addon/hint/css-hint'
import 'codemirror/addon/hint/show-hint'
import 'codemirror/addon/hint/anyword-hint'
import 'codemirror/addon/hint/show-hint.css'
//
import 'codemirror/addon/edit/closebrackets.js'

2、myCodeMirror.css

.vue-codemirror {
    height: 100%;
}
/*.CodeMirror {*/
/*    height: 100%;*/
/*    font-size: 16px;*/
/*    font-weight: 500;*/
/*    line-height: 20px;*/
/*    font-family: monospace;*/
/*}*/



.CodeMirror {
    height: 100%;
    font-size: 16px;
    font-weight: 500;
    line-height: 20px;
    font-family: monospace;
    direction: ltr;
}

/* PADDING */

.CodeMirror-lines {
    padding: 4px 0; /* Vertical padding around content */
}
.CodeMirror pre.CodeMirror-line,
.CodeMirror pre.CodeMirror-line-like {
    padding: 0 4px; /* Horizontal padding of content */
}

.CodeMirror-scrollbar-filler, .CodeMirror-gutter-filler {
    background-color: white; /* The little square between H and V scrollbars */
}

/* GUTTER */

.CodeMirror-gutters {
    border-right: 1px solid #ddd;
    background-color: #f7f7f7;
    white-space: nowrap;
}
.CodeMirror-linenumbers {}
.CodeMirror-linenumber {
    padding: 0 3px 0 5px;
    min-width: 20px;
    text-align: right;
    color: #999;
    white-space: nowrap;
}

.CodeMirror-guttermarker { color: black; }
.CodeMirror-guttermarker-subtle { color: #999; }

/* CURSOR */

.CodeMirror-cursor {
    border-left: 1px solid black;
    border-right: none;
    width: 0;
}
/* Shown when moving in bi-directional text */
.CodeMirror div.CodeMirror-secondarycursor {
    border-left: 1px solid silver;
}
.cm-fat-cursor .CodeMirror-cursor {
    width: auto;
    border: 0 !important;
    background: #7e7;
}
.cm-fat-cursor div.CodeMirror-cursors {
    z-index: 1;
}
.cm-fat-cursor .CodeMirror-line::selection,
.cm-fat-cursor .CodeMirror-line > span::selection,
.cm-fat-cursor .CodeMirror-line > span > span::selection { background: transparent; }
.cm-fat-cursor .CodeMirror-line::-moz-selection,
.cm-fat-cursor .CodeMirror-line > span::-moz-selection,
.cm-fat-cursor .CodeMirror-line > span > span::-moz-selection { background: transparent; }
.cm-fat-cursor { caret-color: transparent; }
@-moz-keyframes blink {
    0% {}
    50% { background-color: transparent; }
    100% {}
}
@-webkit-keyframes blink {
    0% {}
    50% { background-color: transparent; }
    100% {}
}
@keyframes blink {
    0% {}
    50% { background-color: transparent; }
    100% {}
}

/* Can style cursor different in overwrite (non-insert) mode */
.CodeMirror-overwrite .CodeMirror-cursor {}

.cm-tab { display: inline-block; text-decoration: inherit; }

.CodeMirror-rulers {
    position: absolute;
    left: 0; right: 0; top: -50px; bottom: 0;
    overflow: hidden;
}
.CodeMirror-ruler {
    border-left: 1px solid #ccc;
    top: 0; bottom: 0;
    position: absolute;
}

/* DEFAULT THEME */

.cm-s-default .cm-header {color: blue;}
.cm-s-default .cm-quote {color: #090;}
.cm-negative {color: #d44;}
.cm-positive {color: #292;}
.cm-header, .cm-strong {font-weight: bold;}
.cm-em {font-style: italic;}
.cm-link {text-decoration: underline;}
.cm-strikethrough {text-decoration: line-through;}

.cm-s-default .cm-keyword {color: #708;}
.cm-s-default .cm-atom {color: #219;}
.cm-s-default .cm-number {color: #164;}
.cm-s-default .cm-def {color: #00f;}
.cm-s-default .cm-variable,
.cm-s-default .cm-punctuation,
.cm-s-default .cm-property,
.cm-s-default .cm-operator {}
.cm-s-default .cm-variable-2 {color: #05a;}
.cm-s-default .cm-variable-3, .cm-s-default .cm-type {color: #085;}
.cm-s-default .cm-comment {color: #a50;}
.cm-s-default .cm-string {color: #a11;}
.cm-s-default .cm-string-2 {color: #f50;}
.cm-s-default .cm-meta {color: #555;}
.cm-s-default .cm-qualifier {color: #555;}
.cm-s-default .cm-builtin {color: #30a;}
.cm-s-default .cm-bracket {color: #997;}
.cm-s-default .cm-tag {color: #170;}
.cm-s-default .cm-attribute {color: #00c;}
.cm-s-default .cm-hr {color: #999;}
.cm-s-default .cm-link {color: #00c;}

.cm-s-default .cm-error {color: #f00;}
.cm-invalidchar {color: #f00;}

.CodeMirror-composing { border-bottom: 2px solid; }

/* Default styles for common addons */

div.CodeMirror span.CodeMirror-matchingbracket {color: #0b0;}
div.CodeMirror span.CodeMirror-nonmatchingbracket {color: #a22;}
.CodeMirror-matchingtag { background: rgba(255, 150, 0, .3); }
.CodeMirror-activeline-background {background: #e8f2ff;}

/* STOP */

/* The rest of this file contains styles related to the mechanics of
   the editor. You probably shouldn't touch them. */

.CodeMirror {
    position: relative;
    overflow: hidden;
    background: white;
}

.CodeMirror-scroll {
    overflow: scroll !important; /* Things will break if this is overridden */
    /* 50px is the magic margin used to hide the element's real scrollbars */
    /* See overflow: hidden in .CodeMirror */
    margin-bottom: -50px; margin-right: -50px;
    padding-bottom: 50px;
    height: 100%;
    outline: none; /* Prevent dragging from highlighting the element */
    position: relative;
    z-index: 0;
}
.CodeMirror-sizer {
    position: relative;
    border-right: 50px solid transparent;
}

/* The fake, visible scrollbars. Used to force redraw during scrolling
   before actual scrolling happens, thus preventing shaking and
   flickering artifacts. */
.CodeMirror-vscrollbar, .CodeMirror-hscrollbar, .CodeMirror-scrollbar-filler, .CodeMirror-gutter-filler {
    position: absolute;
    z-index: 6;
    display: none;
    outline: none;
}
.CodeMirror-vscrollbar {
    right: 0; top: 0;
    overflow-x: hidden;
    overflow-y: scroll;
}
.CodeMirror-hscrollbar {
    bottom: 0; left: 0;
    overflow-y: hidden;
    overflow-x: scroll;
}
.CodeMirror-scrollbar-filler {
    right: 0; bottom: 0;
}
.CodeMirror-gutter-filler {
    left: 0; bottom: 0;
}

.CodeMirror-gutters {
    position: absolute; left: 0; top: 0;
    min-height: 100%;
    z-index: 3;
}
.CodeMirror-gutter {
    white-space: normal;
    height: 100%;
    display: inline-block;
    vertical-align: top;
    margin-bottom: -50px;
}
.CodeMirror-gutter-wrapper {
    position: absolute;
    z-index: 4;
    background: none !important;
    border: none !important;
}
.CodeMirror-gutter-background {
    position: absolute;
    top: 0; bottom: 0;
    z-index: 4;
}
.CodeMirror-gutter-elt {
    position: absolute;
    cursor: default;
    z-index: 4;
}
.CodeMirror-gutter-wrapper ::selection { background-color: transparent }
.CodeMirror-gutter-wrapper ::-moz-selection { background-color: transparent }

.CodeMirror-lines {
    cursor: text;
    min-height: 1px; /* prevents collapsing before first draw */
}
.CodeMirror pre.CodeMirror-line,
.CodeMirror pre.CodeMirror-line-like {
    /* Reset some styles that the rest of the page might have set */
    -moz-border-radius: 0; -webkit-border-radius: 0; border-radius: 0;
    border-width: 0;
    background: transparent;
    font-family: inherit;
    font-size: inherit;
    margin: 0;
    white-space: pre;
    word-wrap: normal;
    line-height: inherit;
    color: inherit;
    z-index: 2;
    position: relative;
    overflow: visible;
    -webkit-tap-highlight-color: transparent;
    -webkit-font-variant-ligatures: contextual;
    font-variant-ligatures: contextual;
}
.CodeMirror-wrap pre.CodeMirror-line,
.CodeMirror-wrap pre.CodeMirror-line-like {
    word-wrap: break-word;
    white-space: pre-wrap;
    word-break: normal;
}

.CodeMirror-linebackground {
    position: absolute;
    left: 0; right: 0; top: 0; bottom: 0;
    z-index: 0;
}

.CodeMirror-linewidget {
    position: relative;
    z-index: 2;
    padding: 0.1px; /* Force widget margins to stay inside of the container */
}

.CodeMirror-widget {}

.CodeMirror-rtl pre { direction: rtl; }

.CodeMirror-code {
    outline: none;
}

/* Force content-box sizing for the elements where we expect it */
.CodeMirror-scroll,
.CodeMirror-sizer,
.CodeMirror-gutter,
.CodeMirror-gutters,
.CodeMirror-linenumber {
    -moz-box-sizing: content-box;
    box-sizing: content-box;
}

.CodeMirror-measure {
    position: absolute;
    width: 100%;
    height: 0;
    overflow: hidden;
    visibility: hidden;
}

.CodeMirror-cursor {
    position: absolute;
    pointer-events: none;
}
.CodeMirror-measure pre { position: static; }

div.CodeMirror-cursors {
    visibility: hidden;
    position: relative;
    z-index: 3;
}
div.CodeMirror-dragcursors {
    visibility: visible;
}

.CodeMirror-focused div.CodeMirror-cursors {
    visibility: visible;
}

.CodeMirror-selected { background: #d9d9d9; }
.CodeMirror-focused .CodeMirror-selected { background: #d7d4f0; }
.CodeMirror-crosshair { cursor: crosshair; }
.CodeMirror-line::selection, .CodeMirror-line > span::selection, .CodeMirror-line > span > span::selection { background: #d7d4f0; }
.CodeMirror-line::-moz-selection, .CodeMirror-line > span::-moz-selection, .CodeMirror-line > span > span::-moz-selection { background: #d7d4f0; }

.cm-searching {
    background-color: #ffa;
    background-color: rgba(255, 255, 0, .4);
}

/* Used to force a border model for a node */
.cm-force-border { padding-right: .1px; }

@media print {
    /* Hide the cursor when printing */
    .CodeMirror div.CodeMirror-cursors {
        visibility: hidden;
    }
}

/* See issue #2901 */
.cm-tab-wrap-hack:after { content: ''; }

/* Help users use markselection to safely style text background */
span.CodeMirror-selectedtext { background: none; }

codeList下：（有子文件index.js和template.js 以及文件夹iview）

1、iview文件夹下

1.1 test.js（模板代码）

export default `<template>
    <div>{{ msg }}</div>
</template>
<script>
export default {
    data() {
        return {
            msg: 'Hello World!'
        };
    },
    methods: {},
    mounted() {}
};
</script>
<style>
</style>`;

1.2 test.vue（模板页面）

<template>
    <div>{{ msg }}</div>
</template>
<script>
export default {
    data() {
        return {
            msg: 'Hello World!'
        };
    },
    methods: {},
    mounted() {}
};
</script>
<style>
</style>

2、index.js

const files = require.context("../codeList", true, /\.js$/);
let codeList = {}; //通过key取值
//icon
let iconList = {
  template: "el-icon-s-home",
  "element/": "el-icon-eleme",
  "iview/": "ivu-icon ivu-icon-logo-vimeo"
};
//菜单
let menuList = [
  {
    path: "/template",
    name: "template",
    title: "模版"
  }
];
files.keys().forEach(filePath => {
  let key = filePath.substring(2, filePath.lastIndexOf("."));
  // codeList
  if (key !== "index"){
    codeList[key] = files(filePath).default;
  }
  // menuList
  if (key !== "index" && key !== "template") {
    menulistHandle(key);
  }
});
// console.log("codeList", codeList);
// console.log("menuList", menuList);

//路由处理->生成菜单
function menulistHandle(key) {
  let keyArr = key.split("/");

  let Pointer = menuList;

  for (let i = 0, len = keyArr.length; i < len; i++) {
    let lastPointer = Pointer;

    let curnode = keyArr[i];
    //menuList 是否存在
    for (let menu of Pointer) {
      if (menu.title == curnode) {
        Pointer = menu.children;
        break;
      }
    }

    if (lastPointer == Pointer) {
      let name =
        i === keyArr.length - 1 ? key : keyArr.slice(0, i + 1).join("/") + "/";

      let newNode = {
        name,
        title: curnode,
        children: []
      };
      if (i === keyArr.length - 1) {
        delete newNode.children;
      }

      Pointer.push(newNode);
      Pointer = newNode.children;
    }
  }
}
export { codeList, menuList, iconList };

3、template.js

export default `<template>
    <div>{{ msg }}</div>
</template>
<script>
export default {
    data() {
        return {
            msg: 'Hello World!'
        };
    },
    methods: {},
    mounted() {}
};
</script>
<style>
</style>`;

以上为代码部分，仅供参考， 如有不清楚或者源码可联系我。