正如另一位海报所说，有很多陷阱，特别是如果你正在显示的元素（在本例中是菜单）具有交互元素。我发现以下方法相当稳健：

$('#menuscontainer').click(function(event) {
    //your code that shows the menus fully

    //now set up an event listener so that clicking anywhere outside will close the menu
    $('html').click(function(event) {
        //check up the tree of the click target to check whether user has clicked outside of menu
        if ($(event.target).parents('#menuscontainer').length==0) {
            // your code to hide menu

            //this event listener has done its job so we can unbind it.
            $(this).unbind(event);
        }

    })
});

使用流中断、模糊/聚焦事件或任何其他棘手的技术，只需将事件流与元素的亲属关系匹配即可：

$(document).on("click.menu-outside", function(event){
    // Test if target and it's parent aren't #menuscontainer
    // That means the click event occur on other branch of document tree
    if(!$(event.target).parents().andSelf().is("#menuscontainer")){
        // Click outisde #menuscontainer
        // Hide the menus (but test if menus aren't already hidden)
    }
});

要删除事件侦听器外部的单击，只需执行以下操作：

$(document).off("click.menu-outside");

$(document).on('click.menu.hide', function(e){
  if ( !$(e.target).closest('#my_menu').length ) {
    $('#my_menu').find('ul').toggleClass('active', false);
  }
});

$(document).on('click.menu.show', '#my_menu li', function(e){
  $(this).find('ul').toggleClass('active');
});

div {
  float: left;
}

ul {
  padding: 0;
  position: relative;
}
ul li {
  padding: 5px 25px 5px 10px;
  border: 1px solid silver;
  cursor: pointer;
  list-style: none;
  margin-top: -1px;
  white-space: nowrap;
}
ul li ul:before {
  margin-right: -20px;
  position: absolute;
  top: -17px;
  right: 0;
  content: "\25BC";
}
ul li ul li {
  visibility: hidden;
  height: 0;
  padding-top: 0;
  padding-bottom: 0;
  border-width: 0 0 1px 0;
}
ul li ul li:last-child {
  border: none;
}
ul li ul.active:before {
  content: "\25B2";
}
ul li ul.active li {
  display: list-item;
  visibility: visible;
  height: inherit;
  padding: 5px 25px 5px 10px;
}

<script src="https://code.jquery.com/jquery-2.1.4.js"></script>
<div>
  <ul id="my_menu">
    <li>Menu 1
      <ul>
        <li>subMenu 1</li>
        <li>subMenu 2</li>
        <li>subMenu 3</li>
        <li>subMenu 4</li>
      </ul>
    </li>
    <li>Menu 2
      <ul>
        <li>subMenu 1</li>
        <li>subMenu 2</li>
        <li>subMenu 3</li>
        <li>subMenu 4</li>
      </ul>
    </li>
    <li>Menu 3</li>
    <li>Menu 4</li>
    <li>Menu 5</li>
    <li>Menu 6</li>
  </ul>
</div>

这里是jsbin版本http://jsbin.com/xopacadeni/edit?html，css，js，输出

投票选出最受欢迎的答案，但添加

&& (e.target != $('html').get(0)) // ignore the scrollbar

因此，单击滚动条不会隐藏目标元素。

这是我对这个问题找到的最简单的答案：

window.addEventListener('click', close_window = function () {
  if(event.target !== windowEl){
    windowEl.style.display = "none";
    window.removeEventListener('click', close_window, false);
  }
});

您将看到我将函数命名为“close_window”，以便在窗口关闭时删除事件侦听器。

这对我有用

$("body").mouseup(function(e) {
    var subject = $(".main-menu");
    if(e.target.id != subject.attr('id') && !subject.has(e.target).length) {
        $('.sub-menu').hide();
    }
});