CSS基础学习十八：CSS布局之浮动_html/css

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CSS基础学习十八：CSS布局之浮动_html/css_WEB-ITnose

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Jun 24, 2016 am 11:32 AM

CSS布局中说到定位就不得不提浮动，浮动的框可以向左或向右移动，直到它的外边缘碰到包含框或另一个浮动

框的边框为止。由于浮动框不在文档的普通流中，所以文档的普通流中的块框表现得就像浮动框不存在一样。

一float属性的定义和用法

float属性：设置元素浮动

可能的值：

none 不浮动，在文档流内，默认

left 左浮动，脱离文档流

right 右浮动，脱离文档流

inherit规定应该从父元素继承 float属性的值。

float属性定义元素在哪个方向浮动。以往这个属性总应用于图像，使文本围绕在图像周围，不过在CSS中，任何

元素都可以浮动。浮动元素会生成一个块级框，而不论它本身是何种元素。如果浮动非替换元素，则要指定一个明确

的宽度；否则，它们会尽可能地窄。假如在一行之上只有极少的空间可供浮动元素，那么这个元素会跳至下一行，这

个过程会持续到某一行拥有足够的空间为止。

我们用图示和实例来理解元素的浮动：

(1)三个不浮动元素的图示和效果：

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