var fs= require("fs")

fs.exists("dirName", function(exists) {
  console.log(exists ? "创建成功" : "创建失败");
});

var fs = require('fs'); // 引入fs模块
function deleteall(path) {
  var files = [];
  if(fs.existsSync(path)) {
    files = fs.readdirSync(path);
    files.forEach(function(file, index) {
      var curPath = path + "/" + file;
      if(fs.statSync(curPath).isDirectory()) { // recurse
        deleteall(curPath);
      } else { // delete file
        fs.unlinkSync(curPath);
      }
    });
    fs.rmdirSync(path);
  }
};

deleteall("./dir")//将文件夹传入即可