PhantomJS isExecutable

var fs=require('fs'); 
fs.isExecutable(filename);

var fs=require('fs'); 
var system = require('system'); 
var path = system.args[1]; 

if (fs.isExecutable(path)) { 
   console.log(path+" is executable."); 
} else {  
   console.log(path+" is NOT executable."); 
} 
phantom.exit();

touch.js is NOT executable.