ExtendObject.js

function extend(des, src, override) {
    if (src instanceof Array) {
      for (var i = 0, len = src.length; i < len; i++)
        this._extend(des, src[i], override);
    }
    for (var ii in src) {
      if (override || !(ii in des)) {
        des[ii] = src[ii];
      }
    }
    return des;
  }