var fs = require('fs')


//遍历文件夹，获取所有文件夹里面的文件信息
/*
 * @param path 路径
 *
 */

function geFileList(path)
{
 var filesList = [];
 readFile(path,filesList);
 return filesList;
}

//遍历读取文件
function readFile(path,filesList)
{
 files = fs.readdirSync(path);//需要用到同步读取
 files.forEach(walk);
 function walk(file)
 { 
  states = fs.statSync(path+'/'+file);   
  if(states.isDirectory())
  {
   readFile(path+'/'+file,filesList);
  }
  else
  { 
   //创建一个对象保存信息
   var obj = new Object();
   obj.size = states.size;//文件大小，以字节为单位
   obj.name = file;//文件名
   obj.path = path+'/'+file; //文件绝对路径
   filesList.push(obj);
  }  
 }
}

//写入文件utf-8格式
function writeFile(fileName,data)
{ 
 fs.writeFile(fileName,data,'utf-8',complete);
 function complete()
 {
  console.log("文件生成成功");
 } 
}


var filesList = geFileList("G:/nodejs");
filesList.sort(sortHandler);
function sortHandler(a,b)
{
 if(a.size > b.size)
 return -1;
 else if(a.size < b.size) return 1
 return 0;
}
var str='';
for(var i=0;i<filesList.length;i++)
{
 var item = filesList[i];
 var desc ="文件名:"+item.name + " "
  +"大小:"+(item.size/1024).toFixed(2) +"/kb"+" "
  +"路径:"+item.path;
 str+=desc +"\n"
}


writeFile("test.txt",str);