jszip 前端压缩

const JSZip = require("jszip");
const zip = new JSZip();
const fs = require("fs");
const path = require("path");
function readDir(zip, dirPath) {
  // 读取dist下的根文件目录
  const files = fs.readdirSync(dirPath);
  files.forEach(fileName => {
    const fillPath = dirPath + "/" + fileName;
    const file = fs.statSync(fillPath); // 如果是文件夹的话需要递归遍历下面的子文件
    if (file.isDirectory()) {
      const dirZip = zip.folder(fileName);
      readDir(dirZip, fillPath);
    } else {
      // 读取每个文件为buffer存到zip中
      zip.file(fileName, fs.readFileSync(fillPath));
    }
  });
}
function create(sourceDir) {
  readDir(zip, sourceDir);
  zip
    .generateAsync({
    type: "nodebuffer", // 压缩类型
    compression: "DEFLATE", // 压缩算法
    compressionOptions: {
      // 压缩级别
      level: 9
    }
  })
    .then(content => {
    const dest = path.join(__dirname, "./dist/zip");
    if (dest) {
      // 删除旧包目录
      const folder_exists = fs.existsSync("./dist/zip");
      if (folder_exists == true) {
        const dirList = fs.readdirSync("./dist/zip");
        dirList.forEach(function(fileName) {
          fs.unlinkSync("./dist/zip/" + fileName);
        });
      }
    }
    // 创建新包目录
    fs.mkdirSync(dest, { recursive: true }); // 把zip包写到硬盘中，这个content现在是一段buffer
    fs.writeFileSync(`${dest}/miniPrograms.service.zip`, content);
  });
}
function generateZip() {
  const sourceDir = path.join(__dirname, "./dist");
  fs.access(sourceDir, err => {
    if (err) {
      fs.mkdirSync(sourceDir);
    }
    create(sourceDir);
  });
}
generateZip();