nodejs vm

vm.js

var vm = require('vm'),

  code = 'var square = n * n;  console.log(n+"");',
  fn = new Function('n', code),
  script = vm.createScript(code),
  sandbox;
 
n = 5;
sandbox = { n: n };
 
benchmark = function(title, funk) {
  var end, i, start;
  start = new Date;
  for (i = 0; i < 5; i++) {
    funk();
  }
  end = new Date;
  console.log(title + ': ' + (end - start) + 'ms n='+n);
}
 
var ctx = vm.createContext(sandbox);
benchmark('vm.runInThisContext',     function() { vm.runInThisContext(code); });
//benchmark('vm.runInNewContext',      function() { vm.runInNewContext(code, sandbox); });
//benchmark('script.runInThisContext', function() { script.runInThisContext(); });
//benchmark('script.runInNewContext',  function() { script.runInNewContext(sandbox); });
//benchmark('script.runInContext',  function() { script.runInContext(ctx); });
benchmark('fn',                      function() { fn(n); });
 
/*
vm.runInThisContext: 10ms
vm.runInNewContext: 1432ms
script.runInThisContext: 4ms
script.runInNewContext: 1426ms
script.runInContext: 49ms
fn: 0ms
*/


function say(value){
	console.log("hello"+value);
}
var offer = {title:'fdsfds',price:323,value:140};
var initSandbox = {
    http: 123,
    offer: offer,
    done : function(offer) {
        console.log('done!'+offer.value);
    },
    setTimeout: setTimeout,
	say:say
};
var context = vm.createContext(initSandbox);
vm.runInContext("setTimeout(done,100,offer);say('sonygod')", context);