JSON或者对象转化为格式化（缩进+换行）Markdown的json代码块字符串

小月夕在业务中遇到一个需要，需要把来自后端的一个对象转化为md格式并进行渲染。
首先尝试了直接把对象转为json，然后前后分别拼接上```json ```即可.
但是效果如下

{"err_status":0,"principal":null,"_id":"5eaac83927e3e77ecc7e6a68","ip":"::ffff:127.0.0.1","type":"POST","err_type":"TypeError","err_msg":"TypeError: articles.aggregate(...).populate is not a functionnt   at module.exports (C:\Users\w\Desktop\blog\blog-api\router\routers\article\getAllArticle.js:23:12)nt   at C:\Users\w\Desktop\blog\blog-api\router\routers\article\index.js:30:34nt   at Layer.handle [as handle_request] (C:\Users\w\Desktop\blog\blog-api\node_modules\express\lib\router\layer.js:95:5)nt   at next (C:\Users\w\Desktop\blog\blog-api\node_modules\express\lib\router\route.js:137:13)nt   at Route.dispatch (C:\Users\w\Desktop\blog\blog-api\node_modules\express\lib\router\route.js:112:3)nt   at Layer.handle [as handle_request] (C:\Users\w\Desktop\blog\blog-api\node_modules\express\lib\router\layer.js:95:5)nt   at C:\Users\w\Desktop\blog\blog-api\node_modules\express\lib\router\index.js:281:22nt   at Function.process_params (C:\Users\w\Desktop\blog\blog-api\node_modules\express\lib\router\index.js:335:12)nt   at next (C:\Users\w\Desktop\blog\blog-api\node_modules\express\lib\router\index.js:275:10)nt   at Function.handle (C:\Users\w\Desktop\blog\blog-api\node_modules\express\lib\router\index.js:174:3)nt   at router (C:\Users\w\Desktop\blog\blog-api\node_modules\express\lib\router\index.js:47:12)nt   at Layer.handle [as handle_request] (C:\Users\w\Desktop\blog\blog-api\node_modules\express\lib\router\layer.js:95:5)nt   at trim_prefix (C:\Users\w\Desktop\blog\blog-api\node_modules\express\lib\router\index.js:317:13)nt   at C:\Users\w\Desktop\blog\blog-api\node_modules\express\lib\router\index.js:284:7nt   at Function.process_params (C:\Users\w\Desktop\blog\blog-api\node_modules\express\lib\router\index.js:335:12)nt   at Immediate.next (C:\Users\w\Desktop\blog\blog-api\node_modules\express\lib\router\index.js:275:10)","req_data":{"body":{"className":"前端"},"query":{}},"err_file":"C:\Users\w\Desktop\blog\blog-api\router\routers\article\getAllArticle.js","date":"2020-04-30 20:44:41","__v":0}

渲染结果并不会将json跳行和格式化（就连CSDN都无法自动格式化，可想而知这是需要自己实现的）。
然后我尝试直接对逗号后面加上换行(效果如下)

{"err_status":0,
"principal":null,
"_id":"5eaac83927e3e77ecc7e6a68",
"ip":"::ffff:127.0.0.1",
"type":"POST",
"err_type":"TypeError",
"err_msg":"TypeError: articles.aggregate(...).populate is not a functionnt   at module.exports (C:\Users\w\Desktop\blog\blog-api\router\routers\article\getAllArticle.js:23:12)nt   at C:\Users\w\Desktop\blog\blog-api\router\routers\article\index.js:30:34nt   at Layer.handle [as handle_request] (C:\Users\w\Desktop\blog\blog-api\node_modules\express\lib\router\layer.js:95:5)nt   at next (C:\Users\w\Desktop\blog\blog-api\node_modules\express\lib\router\route.js:137:13)nt   at Route.dispatch (C:\Users\w\Desktop\blog\blog-api\node_modules\express\lib\router\route.js:112:3)nt   at Layer.handle [as handle_request] (C:\Users\w\Desktop\blog\blog-api\node_modules\express\lib\router\layer.js:95:5)nt   at C:\Users\w\Desktop\blog\blog-api\node_modules\express\lib\router\index.js:281:22nt   at Function.process_params (C:\Users\w\Desktop\blog\blog-api\node_modules\express\lib\router\index.js:335:12)nt   at next (C:\Users\w\Desktop\blog\blog-api\node_modules\express\lib\router\index.js:275:10)nt   at Function.handle (C:\Users\w\Desktop\blog\blog-api\node_modules\express\lib\router\index.js:174:3)nt   at router (C:\Users\w\Desktop\blog\blog-api\node_modules\express\lib\router\index.js:47:12)nt   at Layer.handle [as handle_request] (C:\Users\w\Desktop\blog\blog-api\node_modules\express\lib\router\layer.js:95:5)nt   at trim_prefix (C:\Users\w\Desktop\blog\blog-api\node_modules\express\lib\router\index.js:317:13)nt   at C:\Users\w\Desktop\blog\blog-api\node_modules\express\lib\router\index.js:284:7nt   at Function.process_params (C:\Users\w\Desktop\blog\blog-api\node_modules\express\lib\router\index.js:335:12)nt   at Immediate.next (C:\Users\w\Desktop\blog\blog-api\node_modules\express\lib\router\index.js:275:10)",
"req_data":{"body":{"className":"前端"},
"query":{}},
"err_file":"C:\Users\w\Desktop\blog\blog-api\router\routers\article\getAllArticle.js",
"date":"2020-04-30 20:44:41",
"__v":0}

后面尝试了各种replace规则效果都不佳

迫不得已只能自己封装一个生成字符串的规则（当时使用的是vue开发，所以并没有对方法进行兼容ie10-的打算），代码如下

function ObjToRetractJsonStr(obj, num) {
              if(!num){//是否第一层
                num = 1;
              }
              let t = ""
              for(let k in obj){
                if(obj[k] !== null && typeof obj[k] === "object"){
                  t += `${"t".repeat(num)}"${k}": ${ObjToRetractJsonStr(obj[k],num+1)},n`
                }else {
                  t += `${"t".repeat(num)}"${k}": ${typeof obj[k] === "string"?"""+obj[k]+""":obj[k]},n`
                }
              }
              //}或者]结束符缩进
              if(Array.isArray(obj)){
                //数组采用[]包裹
                return `[n${t}${"t".repeat(num-1)}]`
              }
              return `{n${t}${"t".repeat(num-1)}}`
   }

//生成md语法的json代码块
text = "```jsonn"+ObjToRetractJsonStr(this.resData)+"n```"

效果如下

{
	"err_status": 0,
	"principal": null,
	"_id": "5eaac83927e3e77ecc7e6a68",
	"ip": "::ffff:127.0.0.1",
	"type": "POST",
	"err_type": "TypeError",
	"err_msg": "TypeError: articles.aggregate(...).populate is not a function
	   at module.exports (C:UserswDesktopblogblog-apirouterroutersarticlegetAllArticle.js:23:12)
	   at C:UserswDesktopblogblog-apirouterroutersarticleindex.js:30:34
	   at Layer.handle [as handle_request] (C:UserswDesktopblogblog-apinode_modulesexpresslibrouterlayer.js:95:5)
	   at next (C:UserswDesktopblogblog-apinode_modulesexpresslibrouterroute.js:137:13)
	   at Route.dispatch (C:UserswDesktopblogblog-apinode_modulesexpresslibrouterroute.js:112:3)
	   at Layer.handle [as handle_request] (C:UserswDesktopblogblog-apinode_modulesexpresslibrouterlayer.js:95:5)
	   at C:UserswDesktopblogblog-apinode_modulesexpresslibrouterindex.js:281:22
	   at Function.process_params (C:UserswDesktopblogblog-apinode_modulesexpresslibrouterindex.js:335:12)
	   at next (C:UserswDesktopblogblog-apinode_modulesexpresslibrouterindex.js:275:10)
	   at Function.handle (C:UserswDesktopblogblog-apinode_modulesexpresslibrouterindex.js:174:3)
	   at router (C:UserswDesktopblogblog-apinode_modulesexpresslibrouterindex.js:47:12)
	   at Layer.handle [as handle_request] (C:UserswDesktopblogblog-apinode_modulesexpresslibrouterlayer.js:95:5)
	   at trim_prefix (C:UserswDesktopblogblog-apinode_modulesexpresslibrouterindex.js:317:13)
	   at C:UserswDesktopblogblog-apinode_modulesexpresslibrouterindex.js:284:7
	   at Function.process_params (C:UserswDesktopblogblog-apinode_modulesexpresslibrouterindex.js:335:12)
	   at Immediate.next (C:UserswDesktopblogblog-apinode_modulesexpresslibrouterindex.js:275:10)",
	"req_data": {
		"body": {
			"className": "前端",
		},
		"query": {
		},
	},
	"err_file": "C:UserswDesktopblogblog-apirouterroutersarticlegetAllArticle.js",
	"date": "2020-04-30 20:44:41",
	"__v": 0,
}

达到要求（内容跳行不会json高亮，如果想高亮不跳行即可）

IE兼容方案推荐
（一个天上飞的理论而已，由于小月夕当时时间并不是很充裕，就无法亮出具体代码了）
可以尝试借鉴栈计算算式的原理，对未格式化的json传进行一个关键符合拆分后进行栈操作，记录一下当前数据的深度并在其中加入对应数量的缩进和换行符即可。

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