javascript - 当鼠标悬停在菜单上时保持下拉打开

Question

大家好，我有点坚持我是一个非常简单的解决方案。然而，它一直在影响我的头脑，所以我想看看是否有其他人可以承受我大脑的压力哈哈。无论如何，我已经创建了一个带有悬停事件的下拉列表以使其出现。因此，当鼠标悬停在按钮上时，会出现下拉菜单。现在我遇到的问题是，当鼠标悬停在菜单上时，我还希望它保留在屏幕上。

$("#ddBtn").hover(function() {
  $("#dropdown").toggle();
});

.ddBtn {
  margin: 20px;
  float: right;
}

.pageBtns {
  display: block;
  margin: 20px;
}

#header {
  position: relative;
  width: 100%;
  height: 60px;
  background-color: #333;
}

#page {
  border: 2px solid #999;
}

#dropdown {
  position: absolute;
  right: 0;
  top: 100%;
  background-color: #d6d6d6;
  display: none;
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div id="header">
  <button id="ddBtn" class="ddBtn">Drop Down</button>

  <div id="dropdown" class="hidden">
    <button class="pageBtns">Page1</button>
    <button class="pageBtns">Page2</button>
    <button class="pageBtns">Page3</button>
    <button class="pageBtns">Page4</button>
    <button class="pageBtns">Page5</button>
  </div>
</div>
<div id="page">
  <p>Received the likewise law graceful his. Nor might set along charm now equal green. Pleased yet equally correct colonel not one. Say anxious carried compact conduct sex general nay certain. Mrs for recommend exquisite household eagerness preserved now.
    My improved honoured he am ecstatic quitting greatest formerly. Ladies others the six desire age. Bred am soon park past read by lain. As excuse eldest no moment. An delight beloved up garrets am cottage private. The far attachment discovered celebrated
    decisively surrounded for and. Sir new the particular frequently indulgence excellence how. Wishing an if he sixteen visited tedious subject it. Mind mrs yet did quit high even you went. Sex against the two however not nothing prudent colonel greater.
    Up husband removed parties staying he subject mr. Unfeeling so rapturous discovery he exquisite. Reasonably so middletons or impression by terminated. Old pleasure required removing elegance him had. Down she bore sing saw calm high. Of an or game
    gate west face shed. &#65279;no great but music too old found arose.</p>
  <p>Received the likewise law graceful his. Nor might set along charm now equal green. Pleased yet equally correct colonel not one. Say anxious carried compact conduct sex general nay certain. Mrs for recommend exquisite household eagerness preserved now.
    My improved honoured he am ecstatic quitting greatest formerly. Ladies others the six desire age. Bred am soon park past read by lain. As excuse eldest no moment. An delight beloved up garrets am cottage private. The far attachment discovered celebrated
    decisively surrounded for and. Sir new the particular frequently indulgence excellence how. Wishing an if he sixteen visited tedious subject it. Mind mrs yet did quit high even you went. Sex against the two however not nothing prudent colonel greater.
    Up husband removed parties staying he subject mr. Unfeeling so rapturous discovery he exquisite. Reasonably so middletons or impression by terminated. Old pleasure required removing elegance him had. Down she bore sing saw calm high. Of an or game
    gate west face shed. &#65279;no great but music too old found arose.</p>
  <p>Received the likewise law graceful his. Nor might set along charm now equal green. Pleased yet equally correct colonel not one. Say anxious carried compact conduct sex general nay certain. Mrs for recommend exquisite household eagerness preserved now.
    My improved honoured he am ecstatic quitting greatest formerly. Ladies others the six desire age. Bred am soon park past read by lain. As excuse eldest no moment. An delight beloved up garrets am cottage private. The far attachment discovered celebrated
    decisively surrounded for and. Sir new the particular frequently indulgence excellence how. Wishing an if he sixteen visited tedious subject it. Mind mrs yet did quit high even you went. Sex against the two however not nothing prudent colonel greater.
    Up husband removed parties staying he subject mr. Unfeeling so rapturous discovery he exquisite. Reasonably so middletons or impression by terminated. Old pleasure required removing elegance him had. Down she bore sing saw calm high. Of an or game
    gate west face shed. &#65279;no great but music too old found arose.</p>
  <p>Received the likewise law graceful his. Nor might set along charm now equal green. Pleased yet equally correct colonel not one. Say anxious carried compact conduct sex general nay certain. Mrs for recommend exquisite household eagerness preserved now.
    My improved honoured he am ecstatic quitting greatest formerly. Ladies others the six desire age. Bred am soon park past read by lain. As excuse eldest no moment. An delight beloved up garrets am cottage private. The far attachment discovered celebrated
    decisively surrounded for and. Sir new the particular frequently indulgence excellence how. Wishing an if he sixteen visited tedious subject it. Mind mrs yet did quit high even you went. Sex against the two however not nothing prudent colonel greater.
    Up husband removed parties staying he subject mr. Unfeeling so rapturous discovery he exquisite. Reasonably so middletons or impression by terminated. Old pleasure required removing elegance him had. Down she bore sing saw calm high. Of an or game
    gate west face shed. &#65279;no great but music too old found arose.</p>
</div>

Answer 1

不用jquery也可以实现:

#header {
  position: relative;
  width: 100%;
  height: 60px;
  background-color: #333;
  padding:10px 0;
}
.dropbtn {
    background-color: #4CAF50;
    color: white;
    padding: 16px;
    font-size: 16px;
    border: none;
    cursor: pointer;

}

.dropdown {
    position: relative;
    display: inline-block;
    float:right
}

.dropdown-content {
    display: none;
    position: absolute;
    background-color: #f9f9f9;
    min-width: 160px;
    box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
    z-index: 1;
}

.dropdown-content a {
    color: black;
    padding: 12px 16px;
    text-decoration: none;
    display: block;
}

.dropdown-content a:hover {background-color: #f1f1f1}

.dropdown:hover .dropdown-content {
    display: block;
}

.dropdown:hover .dropbtn {
    background-color: #3e8e41;
}

<div id="header">
<div class="dropdown">
  <button class="dropbtn">Dropdown</button>
  <div class="dropdown-content">
    <a href="#">Link 1</a>
    <a href="#">Link 2</a>
    <a href="#">Link 3</a>
  </div>
</div>
</div>
<div id="page">
  <p>Received the likewise law graceful his. Nor might set along charm now equal green. Pleased yet equally correct colonel not one. Say anxious carried compact conduct sex general nay certain. Mrs for recommend exquisite household eagerness preserved now.
    My improved honoured he am ecstatic quitting greatest formerly. Ladies others the six desire age. Bred am soon park past read by lain. As excuse eldest no moment. An delight beloved up garrets am cottage private. The far attachment discovered celebrated
    decisively surrounded for and. Sir new the particular frequently indulgence excellence how. Wishing an if he sixteen visited tedious subject it. Mind mrs yet did quit high even you went. Sex against the two however not nothing prudent colonel greater.
    Up husband removed parties staying he subject mr. Unfeeling so rapturous discovery he exquisite. Reasonably so middletons or impression by terminated. Old pleasure required removing elegance him had. Down she bore sing saw calm high. Of an or game
    gate west face shed. &#65279;no great but music too old found arose.</p>
  <p>Received the likewise law graceful his. Nor might set along charm now equal green. Pleased yet equally correct colonel not one. Say anxious carried compact conduct sex general nay certain. Mrs for recommend exquisite household eagerness preserved now.
    My improved honoured he am ecstatic quitting greatest formerly. Ladies others the six desire age. Bred am soon park past read by lain. As excuse eldest no moment. An delight beloved up garrets am cottage private. The far attachment discovered celebrated
    decisively surrounded for and. Sir new the particular frequently indulgence excellence how. Wishing an if he sixteen visited tedious subject it. Mind mrs yet did quit high even you went. Sex against the two however not nothing prudent colonel greater.
    Up husband removed parties staying he subject mr. Unfeeling so rapturous discovery he exquisite. Reasonably so middletons or impression by terminated. Old pleasure required removing elegance him had. Down she bore sing saw calm high. Of an or game
    gate west face shed. &#65279;no great but music too old found arose.</p>
  <p>Received the likewise law graceful his. Nor might set along charm now equal green. Pleased yet equally correct colonel not one. Say anxious carried compact conduct sex general nay certain. Mrs for recommend exquisite household eagerness preserved now.
    My improved honoured he am ecstatic quitting greatest formerly. Ladies others the six desire age. Bred am soon park past read by lain. As excuse eldest no moment. An delight beloved up garrets am cottage private. The far attachment discovered celebrated
    decisively surrounded for and. Sir new the particular frequently indulgence excellence how. Wishing an if he sixteen visited tedious subject it. Mind mrs yet did quit high even you went. Sex against the two however not nothing prudent colonel greater.
    Up husband removed parties staying he subject mr. Unfeeling so rapturous discovery he exquisite. Reasonably so middletons or impression by terminated. Old pleasure required removing elegance him had. Down she bore sing saw calm high. Of an or game
    gate west face shed. &#65279;no great but music too old found arose.</p>
  <p>Received the likewise law graceful his. Nor might set along charm now equal green. Pleased yet equally correct colonel not one. Say anxious carried compact conduct sex general nay certain. Mrs for recommend exquisite household eagerness preserved now.
    My improved honoured he am ecstatic quitting greatest formerly. Ladies others the six desire age. Bred am soon park past read by lain. As excuse eldest no moment. An delight beloved up garrets am cottage private. The far attachment discovered celebrated
    decisively surrounded for and. Sir new the particular frequently indulgence excellence how. Wishing an if he sixteen visited tedious subject it. Mind mrs yet did quit high even you went. Sex against the two however not nothing prudent colonel greater.
    Up husband removed parties staying he subject mr. Unfeeling so rapturous discovery he exquisite. Reasonably so middletons or impression by terminated. Old pleasure required removing elegance him had. Down she bore sing saw calm high. Of an or game
    gate west face shed. &#65279;no great but music too old found arose.</p>
</div>