html - css 过渡属性不适用于悬停

Question

当我将鼠标悬停在 block 上时，我正在尝试应用 css 过渡属性。但它不起作用。这是代码

.dropdown {
  position: absolute;
  display: inline-block;
  z-index: 1;
  top: 25px;
}

.dropbtn {
  background-color: #4CAF50;
  color: white;
  padding: 15px;
  font-size: 20px;
  border-radius: 0 5px 5px 0;
  border: none;
  transition: 0.4s;
}

.dropdown-content {
  display: none;
  background-color: #4CAF50;
  min-width: 160px;
  box-shadow: 0px 8px 16px 0px rgba(0, 0, 0, 0.2);
  z-index: 1;
  border-radius: 0 5px 5px 0;
}

.dropdown:hover {
  left: 20px;
}

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

.dropdown:hover .dropdown-content {
  display: inline-grid;
}

<div class="dropdown">
  <button class="dropbtn" id="service">
          Services
        </button>
  <div class="dropdown-content">
    <a href="#">Service1</a>
    <a href="#">Service2</a>

  </div>
</div>

是因为我添加了下拉菜单还是我遗漏了什么？我是这个领域的新手。我们将不胜感激。

Answer 1

这不可能在您的代码中显示

你可以翻译 Opacity , width , height , background-color , ...

.dropdown {
  position: absolute;
  display: inline-block;
  z-index: 1;
  top: 25px;
}

.dropbtn {
  background-color: #4CAF50;
  color: white;
  padding: 15px;
  font-size: 20px;
  border-radius: 0 5px 5px 0;
  border: none;
}

.dropdown-content {
  display: inline-grid;
  background-color: #4CAF50;
  min-width: 160px;
  box-shadow: 0px 8px 16px 0px rgba(0, 0, 0, 0.2);
  z-index: 1;
  border-radius: 0 5px 5px 0;
  Opacity:0;
}

.dropdown:hover {
  left: 20px;
}

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

.dropdown:hover .dropdown-content {
   transition:all 1s ease;
  Opacity:1;
}

<div class="dropdown">
  <button class="dropbtn" id="service">
          Services
        </button>
  <div class="dropdown-content">
    <a href="#">Service1</a>
    <a href="#">Service2</a>

  </div>
</div>

jsfiddle

More information