官方文档 http://phantomjs.org/api/fs/
一个栗子胜千言:
var fs = require('fs');
var file = fs.open('d:/1.txt', 'r'); //'r', 'w', 'a/+', 'b'
if(fs.makeDirectory(‘d:/Full/’))
console.log('"'+path+'" was created.');
var content = fs.read('d:/1.txt');
fs.write('d:/2.txt', content, 'w');
file.close();
phantom.exit();