Home Web Front-end HTML Tutorial CSS基础学习十八:CSS布局之浮动_html/css_WEB-ITnose

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

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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