一个全局替换图片地址的脚本

全局替换图片地址的脚本，运行时执行；

    const path = require('path');
const express = require('express');
const axios = require('axios');
const fs = require('fs');
const bodyParser = require('body-parser');//解析,用req.body获取post参数

const app = express();
app.use(bodyParser.json({limit: '50mb'}));
app.use(bodyParser.urlencoded({limit: '50mb', extended: true}));


const createPngFile = async (url, filePath) => {
  const writer = fs.createWriteStream(filePath);
  try {
    await axios(
      {
        url,
      　responseType: "stream",
  　}).then(response => {
      response.data.pipe(writer)
    　return new Promise((resolve, reject) => {
        　　writer.on("finish", resolve)
        　　writer.on("error", reject)
    　})
    }).catch((error)=> {
      console.log('--------error',error);
    })
  } catch (err) {
    throw err;
  }
  
}
// 获取与id对应的md文档路径并替换
const getMdPath = (mdList, mdId, url, imageName, docDirPath) => {
  mdList.forEach(({children, id, content}) => {
    if (children && children.length) {
      getMdPath(children, mdId, url, imageName, docDirPath)
    } else {
      if (mdId === id) {
        // TODO: 读取md文件
        // 去掉content中的点
        const _docPath = content.replace(/^./,'');
        const docPath = `${docDirPath}${_docPath}`;
        const data = fs.readFileSync(docPath,'utf-8');
        const picUrlReg = RegExp("!\\[\(.*?\)\\]\\(" + url + "\\)","g");
        const repContent = data.replace(picUrlReg, `![${imageName}](/images/${id}/${imageName})`);
        fs.writeFileSync(docPath, repContent, {encoding: 'utf8'})
      }
    }
  })
}



const testGET = async (mdId, imgList, imagePath, docDirPath) => {
  const data = fs.readFileSync(`${docDirPath}/index.ts`);
  // TODO:解析md菜单
  const _data = data.toString();
  const _strsListStr = _data.split("=")[3].replace(/require\(|\)|\).default|.default|;/g,'');
  const func = new Function('return (' + _strsListStr + ')');
  const mdList = func();

  fs.readdir(imagePath, (err, files) => {
    if(err) throw err;
    const imgDirName = `${imagePath}/${mdId}`;
    const dirIsExist = files.some(file => mdId == file);
    if (!dirIsExist) {
      fs.mkdir(imgDirName, (err) => {
        if (!err) {
          imgList.forEach(({url, imageName}, i) => {
            let _imageName = imageName;
            if (_imageName === 'image.png') {
              _imageName = `image${i}.png`;
            } 
            createPngFile(url,`${imagePath}/${mdId}/${_imageName}`);
            getMdPath(mdList, mdId, url, _imageName, docDirPath)
          })
        } else {
          throw err;
        }
      })
    } else {
      fs.readdir(imgDirName, (err, imgFiles) => {
        if(err) throw err;
        imgList.forEach(({url, imageName}, i) => {
          if (imgFiles.length) {
            (imgFiles || []).forEach(item => {
              if (item && imageName === item) {
                // TODO: 先删文件再创建
                fs.unlinkSync(`${imagePath}/${mdId}/${item}`);
                createPngFile(url,`${imagePath}/${mdId}/${item}`);
                getMdPath(mdList, mdId, url, item, docDirPath);
              } else {
                let _imageName = imageName;
                if (_imageName === 'image.png') {
                  _imageName = `image${i}.png`;
                } 
                createPngFile(url,`${imagePath}/${mdId}/${_imageName}`);
                getMdPath(mdList, mdId, url, _imageName, docDirPath);
              }
            })
          } else {
            let _imageName = imageName;
            if (_imageName === 'image.png') {
              _imageName = `image${i}.png`;
            } 
            createPngFile(url,`${imagePath}/${mdId}/${imageName}`);
            getMdPath(mdList, mdId, url, imageName, docDirPath);
          }
        })
      })

    }
  })
}　

app.post('/pic',function(req,res){
  const data = req.body;
  const { id, imgList, imagePath, docDirPath } = data;
  testGET(id, imgList, imagePath, docDirPath).then(() => {
    console.log('0000000000000','写入成功了吗？')
  })
  const responseObject = {//也可以是数组 数组也会转化为json
    success: true,
    code: 200
  }
  res.json(responseObject)

});

app.listen("8888", 'localhost', function(err) {
  if(err){
    console.log(err);
    return;
  }
  console.log('Listening at http://localhost:8888');
});