CSS 中的 min-height 属性

cssweb developmentfront end technology更新于 2025/1/18 0:44:17

我们可以使用 CSS min-height 属性为元素的内容框定义一个固定的最小高度，这样即使高度小于 min-height，元素的内容框也不会变小。

语法

CSS min-height 属性的语法如下 −

Selector {
   min-height: /*value*/
}

示例

让我们看一个 CSS min-height 属性的示例 −

<!DOCTYPE html>
<html>
<head>
<title>CSS min-height Property</title>
</head>
<style>
* {
   padding: 2px;
   margin:5px;
}
button {
   border-radius: 10px;
}
#containerDiv {
   width:70%;
   margin: 0 auto;
   padding:20px;
   background-image: linear-gradient(135deg, #dc3545 0%, #9599E2 100%);
   text-align: center;
   border-radius: 10px;
}
#contentDiv{
   min-height:150px;
}
</style>
<body>
<div id="containerDiv">
<div id="contentDiv">
This is paragraph 1 with some dummy text. This is paragraph 1 with some dummy text.
This is paragraph 1 with some dummy text. This is paragraph 1 with some dummy text.
This is paragraph 1 with some dummy text. This is paragraph 1 with some dummy text.
</div>
<button onclick="add()" class="btn">Set minHeight</button>
</div>
<script>
   function add() {
      document.querySelector('#contentDiv').style.minHeight = "100px";
   }
</script>
</body>
</html>

输出

以下是上述代码的输出 −

点击"设置最小高度"按钮之前 −

点击"设置最小高度"按钮之后按钮 −

示例

让我们看另一个 CSS min-height 属性的示例 −

<!DOCTYPE html>
<html>
<head>
<title>CSS min-height Property</title>
</head>
<style>
* {
   padding: 2px;
   margin:5px;
}
button {
   border-radius: 10px;
}
#containerDiv {
   width:70%;
   margin: 0 auto;
   padding:20px;
   background-image: linear-gradient(135deg, #dc3545 0%, #9599E2 100%);
   text-align: center;
   border-radius: 10px;
}
#contentDiv1, #contentDiv2{
   width:50%;
   border: 2px solid black;
   margin: 0 auto;
}
</style>
<body>
<div id="containerDiv">
<div id="contentDiv1">
This is paragraph 1 with some dummy text. This is paragraph 1 with some dummy text.
</div>
<div id="contentDiv2">
This is paragraph 1 with some dummy text.
This is paragraph 1 with some dummy text.
This is paragraph 1 with some dummy.
</div>
<button onclick="add()" class="btn">Set minHeight</button>
</div>
<script>
   function add() {
      document.querySelector('#contentDiv1').style.minHeight = "95px";
   }
</script>
</body>
</html>