JS组件Bootstrap dropdown组件扩展hover事件

// bootstrap响应式导航条<br>;(function($, window, undefined) {
 // outside the scope of the jQuery plugin to
 // keep track of all dropdowns
 var $allDropdowns = $();
 
 // if instantlyCloseOthers is true, then it will instantly
 // shut other nav items when a new one is hovered over
 $.fn.dropdownHover = function(options) {
 
  // the element we really care about
  // is the dropdown-toggle's parent
  $allDropdowns = $allDropdowns.add(this.parent());
 
  return this.each(function() {
   var $this = $(this).parent(),
    defaults = {
     delay: 500,
     instantlyCloseOthers: true
    },
    data = {
     delay: $(this).data('delay'),
     instantlyCloseOthers: $(this).data('close-others')
    },
    options = $.extend(true, {}, defaults, options, data),
    timeout;
 
   $this.hover(function() {
    if(options.instantlyCloseOthers === true)
     $allDropdowns.removeClass('open');
 
    window.clearTimeout(timeout);
    $(this).addClass('open');
   }, function() {
    timeout = window.setTimeout(function() {
     $this.removeClass('open');
    }, options.delay);
   });
  });
 };
 
 $('[data-hover="dropdown"]').dropdownHover();
})(jQuery, this);