phpjs/experimental/language/clone.js

php.js offers community built php functions in javascript

function clone(object) {
  // http://kevin.vanzonneveld.net
  // +   original by: Brett Zamir (http://brett-zamir.me)
  // *     example 1: var obj = {a:5, __clone: function () {this.b=10;}};
  // *     example 1: clone(obj);
  // *     returns 1: {a:5, __clone: function () {this.b=10;}, b:10}

  var retObj = {};

  // As per PHP, make only a shallow copy
  for (var prop in object) {
    retObj[prop] = object[prop];
  }
  if (retObj.__clone) {
    retObj.__clone();
  }

  return retObj;
}