node_modules文件名过长无法删除

var fs=require('fs');  
var path = require('path');  
function ls(ff)  
{  
    var files=fs.readdirSync(ff); 
    var i = 0; 
    for(fn in files)  
    {  
        var fname = ff+path.sep+files[fn]; 
        var fnew = ff+path.sep+'a'+i++; 
        fs.renameSync(fname, fnew);
        //console.log(fname);  
        var stat = fs.lstatSync(fnew);  
        if(stat.isDirectory() == true)  
        {  
            ls(fnew);  
        }  
        else  
        {  
            //console.log(fname); 
            //fs.rename(fname, newPath, callback) 
        }  
        //break;
    }  
}  
ls('C:/Users/Jan/AppData/Roaming/npm/node_modules/parse-server');