JS 구성 요소 부트스트랩 드롭다운 구성 요소는 hover event_javascript 기술을 확장합니다.

// 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);