بناء مكتبة جافاسكريبت من الصفر ـ الجزء الثاني

function o(selector) {
  if (this == window) {
    return new o(selector);
  }
  if (typeof selector == "string") {
    this.el = Sizzle(selector);
  } else if (typeof selector == "object" && selector.nodeType != "undefined") {
    this.el = selector;
  } else {
    throw "Invalid selector!";
  }
}
 
o.prototype.bind = function (event, callback) {
  if (o.isArray(this.el)) {
    this.el.forEach(function (elm) {
      o.addEvent(elm, event, callback);
    });
  } else {
    o.addEvent(this.el, event, callback);
  }
  return this;
};
o.prototype.unbind = function (event, callback) {
  if (o.isArray(this.el)) {
    this.el.forEach(function (elm) {
      o.removeEvent(elm, event, callback);
    });
  } else {
    o.removeEvent(this.el, event, callback);
  }
  return this;
};
o.prototype.show = function () {
  this.el.forEach(function (elm) {
    elm.style.display == "none" && (elm.style.display = "");
  });
};
o.prototype.hide = function () {
  this.el.forEach(function (elm) {
    elm.style.display = "none";
  });
};
 
o.addEvent = function (el, event, callback) {
  el.addEventListener(event, callback);
};
o.removeEvent = function (el, event, callback) {
  el.removeEventListener(event, callback);
};
o.isArray =
  Array.isArray ||
  function (obj) {
    return obj instanceof Array;
  };