HTML+CSS3+JS 实现的下拉菜单(3)

// Dropdown Menu var dropdown = document.querySelectorAll('.dropdown'); var dropdownArray = Array.prototype.slice.call(dropdown,0); dropdownArray.forEach(function(el){ var button = el.querySelector('a[data-toggle="dropdown"]'), menu = el.querySelector('.dropdown-menu'), arrow = button.querySelector('i.icon-arrow'); button.onclick = function(event) { if(!menu.hasClass('show')) { menu.classList.add('show'); menu.classList.remove('hide'); arrow.classList.add('open'); arrow.classList.remove('close'); event.preventDefault(); } else { menu.classList.remove('show'); menu.classList.add('hide'); arrow.classList.remove('open'); arrow.classList.add('close'); event.preventDefault(); } }; }) Element.prototype.hasClass = function(className) { return this.className && new RegExp("(^|\\s)" + className + "(\\s|$)").test(this.className); };

（编辑：ASP站长网）