我还找到了一个解决办法。

假设Twitter Bootstrap Components相关事件处理程序被委托给文档对象，我循环所附的处理程序，并检查当前单击的元素(或其父元素之一)是否与委托的事件有关。

$('ul.dropdown-menu.mega-dropdown-menu').on('click', function(event){
    var events = $._data(document, 'events') || {};
    events = events.click || [];
    for(var i = 0; i < events.length; i++) {
        if(events[i].selector) {

            //Check if the clicked element matches the event selector
            if($(event.target).is(events[i].selector)) {
                events[i].handler.call(event.target, event);
            }

            // Check if any of the clicked element parents matches the 
            // delegated event selector (Emulating propagation)
            $(event.target).parents(events[i].selector).each(function(){
                events[i].handler.call(this, event);
            });
        }
    }
    event.stopPropagation(); //Always stop propagation
});

希望它能帮助任何寻求类似解决方案的人。

谢谢大家的帮助。

Bootstrap提供以下功能:

                 | This event is fired immediately when the hide instance method 
hide.bs.dropdown | has been called. The toggling anchor element is available as the 
                 | relatedTarget property of the event.

因此，实现这个函数应该能够禁止关闭下拉列表。

$('#myDropdown').on('hide.bs.dropdown', function (e) {
    var target = $(e.clickEvent.target);
    if(target.hasClass("keepopen") || target.parents(".keepopen").length){
        return false; // returning false should stop the dropdown from hiding.
    }else{
        return true;
    }
});

Bootstrap已经解决了这个问题，他们在下拉菜单中支持<form>标签。他们的解决方案很容易理解，你可以在这里阅读:https://github.com/twbs/bootstrap/blob/v4-dev/js/src/dropdown.js

这可以归结为在文档元素上阻止传播，并且只对click.bs.dropdown类型的事件这样做。Data-api '匹配选择器'。下拉.your-custom-class-for-keep-open-on-click-elements”。

或者在代码中

$(document).on('click.bs.dropdown.data-api', '.dropdown .keep-open-on-click', (event) => {
    event.stopPropagation();
});

在Bootstrap 4中，你也可以这样做:

$('#dd-link').on('hide.bs.dropdown', onListHide)

function onListHide(e)
{
  if(e.clickEvent && $.contains(e.relatedTarget.parentNode, e.clickEvent.target)) {
  e.preventDefault()
  }
}

其中#dd-link是具有data-toggle=" drowdown "属性的锚定元素或按钮。

[Bootstrap 4 Alpha 6][Rails] 对于rails开发人员来说，e.s stoppropagation()将导致link_to的data-method不等于get的不良行为，因为它默认将所有请求返回为get。

为了解决这个问题，我建议这个解决方案，它是通用的

$('.dropdown .dropdown-menu').on('click.bs.dropdown', function() {
  return $('.dropdown').one('hide.bs.dropdown', function() {
    return false;
  });
});

$('.dropdown .dropdown-menu').on('click.bs.dropdown', function() { return $('.dropdown').one('hide.bs.dropdown', function() { return false; }); }); <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-alpha.6/css/bootstrap.min.css" integrity="sha384-rwoIResjU2yc3z8GV/NPeZWAv56rSmLldC3R/AZzGRnGxQQKnKkoFVhFQhNUwEyJ" crossorigin="anonymous"> <script src="https://code.jquery.com/jquery-3.1.1.slim.min.js" integrity="sha384-A7FZj7v+d/sdmMqp/nOQwliLvUsJfDHW+k9Omg/a/EheAdgtzNs3hpfag6Ed950n" crossorigin="anonymous"></script> <script src="https://cdnjs.cloudflare.com/ajax/libs/tether/1.4.0/js/tether.min.js" integrity="sha384-DztdAPBWPRXSA/3eYEEUWrWCy7G5KFbe8fFjk5JAIxUYHKkDx6Qin1DkWx51bBrb" crossorigin="anonymous"></script> <script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-alpha.6/js/bootstrap.min.js" integrity="sha384-vBWWzlZJ8ea9aCX4pEW3rVHjgjt7zpkNpZk+02D9phzyeVkE+jo0ieGizqPLForn" crossorigin="anonymous"></script> <ul class="nav navbar-nav"> <li class="dropdown mega-dropdown"> <a href="javascript:;" class="dropdown-toggle" data-toggle="dropdown"> <i class="fa fa-list-alt"></i> Menu item 1 <span class="fa fa-chevron-down pull-right"></span> </a> <ul class="dropdown-menu mega-dropdown-menu"> <li> <div id="carousel" class="carousel slide" data-ride="carousel"> <ol class="carousel-indicators"> <li data-slide-to="0" data-target="#carousel"></li> <li class="active" data-slide-to="1" data-target="#carousel"></li> </ol> <div class="carousel-inner"> <div class="item"> <img alt="" class="img-rounded" src="img1.jpg"> </div> <div class="item active"> <img alt="" class="img-rounded" src="img2.jpg"> </div> </div> <a data-slide="prev" role="button" href="#carousel" class="left carousel-control"> <span class="glyphicon glyphicon-chevron-left"></span> </a> <a data-slide="next" role="button" href="#carousel" class="right carousel-control"> <span class="glyphicon glyphicon-chevron-right"></span> </a> </div> </li> </ul> </li> </ul>

您可以简单地执行事件。链接本身的点击事件的stopPropagation。 就像这样。

    $(".dropdown-menu a").click((event) => {
         event.stopPropagation()
         let url = event.target.href
         //Do something with the url or any other logic you wish
    })

编辑:如果有人看到这个答案，并正在使用react，它将无法工作。 React以不同的方式处理javascript事件，当你的React事件处理程序被调用时，事件已经被触发并传播。为了克服这个问题，您应该像这样手动附加事件

handleMenuClick(event) {
   event.stopPropagation()
   let menu_item = event.target
   //implement your logic here.
}
componentDidMount() {
    document.getElementsByClassName("dropdown-menu")[0].addEventListener(
        "click", this.handleMenuClick.bind(this), false)
   }
}