基于CodeMirror开发在线编辑器时遇到的问题及解决方案

需求：实现json在线编辑并支持校验，基于此使用了 CodeMirror在线编辑，jsonlint校验输入数据

// package.json:
  "dependencies": {
    "codemirror": "^5.53.2",
    "core-js": "^3.8.3",
    "jsonlint": "^1.6.3",
    "vue": "^2.6.14"
  },

基础代码：

<template>
  <div class="json-editor">
    <textarea ref="textarea" />
  </div>
</template>

<script>
import CodeMirror from "codemirror";
import "codemirror/addon/lint/lint.css";
import "codemirror/lib/codemirror.css";
import "codemirror/theme/rubyblue.css";
import "codemirror/mode/javascript/javascript";
import "codemirror/addon/lint/lint";
import "codemirror/addon/lint/json-lint";
require('script-loader!jsonlint')
export default {
  name: "JsonEditor", 
  props: ["value"],
  data() {
    return {
      jsonEditor: false,
    };
  },
  watch: {
    value(value) {
      const editorValue = this.jsonEditor.getValue();
      if (value !== editorValue) {
        this.jsonEditor.setValue(JSON.stringify(this.value, null, 2));
      }
    },
  },
  mounted() {
    // CodeMirror.fromTextArea()中第一个参数是DOM元素，而且必须是textarea元素；第二个参数是可选配置项
    this.jsonEditor = CodeMirror.fromTextArea(this.$refs.textarea, {
      lineNumbers: true,
      mode: "application/json",
      gutters: ["CodeMirror-lint-markers"],
      theme: "rubyblue",
      lint: true,
      lineWrapping: true, // 自动换行
      scrollPastEnd: true, // 允许用户将一个编辑器高度的空白区域滚动到编辑器底部的视图
      lineNumbers: true, // 显示左边行号（默认false,即不显示）
      styleActiveLine: true, // 当前行背景高亮
    });

    this.jsonEditor.setValue(JSON.stringify(this.value, null, 2));
    this.jsonEditor.on("change", (cm) => {
      console.log("cm.getValue() :>> ", cm.getValue());
      this.$emit("changed", cm.getValue());
      this.$emit("input", cm.getValue());
    });
  },
  methods: {
    getValue() {
      return this.jsonEditor.getValue();
    },
  },
};
</script>

<style scoped>
.json-editor {
  height: 100%;
  position: relative;
}
.json-editor >>> .CodeMirror {
  height: auto;
  min-height: 300px;
}
.json-editor >>> .CodeMirror-scroll {
  min-height: 300px;
}
.json-editor >>> .cm-s-rubyblue span.cm-string {
  color: #f08047;
}
.addbtn {
  margin-bottom: 15px;
  margin-left: 30px;
}
</style>

这样，他就成功的报错了！
报错原因是因为这一行：require('script-loader!jsonlint')
项目找不到script-loader，因而下了一个：

npm install script-loader

下载完毕，项目就有了雏形：

但是估计错误输入后发现，并没有实现错误校验功能，很纳闷，明明写了lint:true
然后尝试打开控制台看了下：

json-lint.js:22  Error: window.jsonlint not defined, CodeMirror JSON linting cannot run.

不懂为什么，于是尝试使用import替换require
依旧如此
后来去github翻了下issue, 发现此条可用：
https://github.com/scniro/react-codemirror2/issues/21

须下载jsonlint-mod:

npm install jsonlint-mod

于是便实现了：

完整代码(无坑版)：

<template>
  <div class="json-editor">
    <textarea ref="textarea" />
  </div>
</template>

<script>
import CodeMirror from "codemirror";
import "codemirror/addon/lint/lint.css";
import "codemirror/lib/codemirror.css";
import "codemirror/theme/rubyblue.css";
import "codemirror/mode/javascript/javascript";
import "codemirror/addon/lint/lint";
import "codemirror/addon/lint/json-lint";
const jsonlint = require("jsonlint-mod");
console.log('jsonlint :>> ', jsonlint);
window.jsonlint = jsonlint;
export default {
  name: "JsonEditor", 
  props: ["value"],
  data() {
    return {
      jsonEditor: false,
    };
  },
  watch: {
    value(value) {
      const editorValue = this.jsonEditor.getValue();
      if (value !== editorValue) {
        this.jsonEditor.setValue(JSON.stringify(this.value, null, 2));
      }
    },
  },
  mounted() {
    // CodeMirror.fromTextArea()中第一个参数是DOM元素，而且必须是textarea元素；第二个参数是可选配置项
    this.jsonEditor = CodeMirror.fromTextArea(this.$refs.textarea, {
      lineNumbers: true,
      mode: "application/json",
      gutters: ["CodeMirror-lint-markers"],
      theme: "rubyblue",
      lint: true,
      lineWrapping: true, // 自动换行
      scrollPastEnd: true, // 允许用户将一个编辑器高度的空白区域滚动到编辑器底部的视图
      lineNumbers: true, // 显示左边行号（默认false,即不显示）
      styleActiveLine: true, // 当前行背景高亮
    });

    this.jsonEditor.setValue(JSON.stringify(this.value, null, 2));
    this.jsonEditor.on("change", (cm) => {
      console.log("cm.getValue() :>> ", cm.getValue());
      this.$emit("changed", cm.getValue());
      this.$emit("input", cm.getValue());
    });
  },
  methods: {
    getValue() {
      return this.jsonEditor.getValue();
    },
  },
};
</script>

<style scoped>
.json-editor {
  height: 100%;
  position: relative;
}
.json-editor >>> .CodeMirror {
  height: auto;
  min-height: 300px;
}
.json-editor >>> .CodeMirror-scroll {
  min-height: 300px;
}
.json-editor >>> .cm-s-rubyblue span.cm-string {
  color: #f08047;
}
.addbtn {
  margin-bottom: 15px;
  margin-left: 30px;
}
</style>

以上。