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CSS中overflow属性怎么使用

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Lepaskan： 2018-12-10 14:19:17

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CSS中overflow属性是经常可以用到的属性，接下来的这篇文章我们就来看看CSS中overflow属性的具体用法。

overflow

我们首先来看一下overflow属性的值有哪些？

overflow 属性规定当内容溢出元素框时发生的事情。

overflow有以下四个属性值

visible：初始值，内容不会被修剪，会呈现在元素框之外。

scroll：内容会被修剪，但是浏览器会显示滚动条以便查看其余的内容。

hidden：内容会被修剪，并且其余内容是不可见的。

auto：如果内容被修剪，则浏览器会显示滚动条以便查看其余的内容。

下面我们来详细说一说overflow属性的这四个值

我们来看具体的示例

代码如下

HTML代码

<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8">
    <title>CSS overflow</title>
    <link rel="stylesheet" type="text/css" href="sample.css">
  </head>
  <body>
    <div class="hid">
      <p>
        The European languages are members of the same family. Their separate existence is a myth. For science, music, sport, etc, Europe uses the same vocabulary. The languages only differ in their grammar, their pronunciation and their most common words. Everyone realizes why a new common language would be desirable: one could refuse to pay expensive translators.
      </p>
    </div>
    <br>
    <div class="scr">
      <p>
        The European languages are members of the same family. Their separate existence is a myth. For science, music, sport, etc, Europe uses the same vocabulary. The languages only differ in their grammar, their pronunciation and their most common words. Everyone realizes why a new common language would be desirable: one could refuse to pay expensive translators.
      </p>
    </div>
    <br>
    <div class="vis">
      <p>
        The European languages are members of the same family. Their separate existence is a myth. For science, music, sport, etc, Europe uses the same vocabulary. The languages only differ in their grammar, their pronunciation and their most common words. Everyone realizes why a new common language would be desirable: one could refuse to pay expensive translators.
      </p>
    </div>
  </body>
</html>

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CSS代码

/*hidden*/
div.hid{
  width: 200px;
  height: 100px;
  overflow: hidden;
  background-color: #FF9999;
}
/*scroll*/
div.scr{
  width: 200px;
  height: 100px;
  overflow: scroll;
  background-color: #99FF99;
}
/*visible*/
div.vis{
  width: 200px;
  height: 100px;
  overflow: visible;
  background-color: #9999FF;
}

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在浏览器上显示如下结果

当overflow的属性值是hidden时，效果如下

overflow

在hidden的情况下，不会显示出剩下的部分，也不能滚动显示剩下的内容。

当overflow的属性值是scroll时，效果如下

overflow

在scroll的情况下，没有显示的内容可以滚动。默认的情况下，文字在横向上会折回，垂直方向显示滚动栏。

在css中设置white-space : nowrap（不自动改行的意思），也可以向横向滚动。

CSS代码

div.scr{
  width: 200px;
  height: 100px;
  white-space:nowrap;
  overflow: scroll;
  background-color: #99FF99;
}

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效果如下

2345截图20181210135009.png

此外，也可以使用overflow-x和overflow-y属性对垂直和横向的滚动条的显示进行更为细致的设置。

当overflow的属性值是visible时，效果如下

2345截图20181210135431.png

visible的情况下，从盒子中溢出显示。紫色的部分是div盒子。默认的情况下，文字在div的横向width中被折回，并在纵向方向上显示。

这个也和scroll属性值一样，在css中设置white-space : nowrap，也可以横向滚动。

另外，如果不设置盒子的高度，就会自动改变盒子的高度。

div.vis{
  width: 200px;
  /* height: 100px;  */
  overflow: visible;
  background-color: #9999FF;
}

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效果如下

2345截图20181210140026.png

最后，我们来看看当overflow属性值是auto时的具体情况

HTML代码

<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>CSS overflow</title>
  <link rel="stylesheet" type="text/css" href="sample.css">
</head>
<body>
<div class="aut">
  <p>
    The European languages are members of the same family. Their separate existence is a myth. For science, music, sport, etc, Europe uses the same vocabulary. The languages only differ in their grammar, their pronunciation and their most common words. Everyone realizes why a new common language would be desirable: one could refuse to pay expensive translators.
      </p>
    </div>
  </body>
</html>

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CSS代码

div.aut{
	width: 200px;
	height: 100px;
	overflow: auto;
	background-color: red;
}

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在浏览器上运行的效果和scroll相似

2345截图20181210140828.png

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