DIV+CSS之清除浮动总结 - 技术相关 - 老奔

DIV+CSS之清除浮动总结

当元素有浮动属性时，会对其父元素或后面的元素产生影响，会出现一个布局错乱的现象，可以通过清除浮动的方法来解决浮动的影响。

浮动的清理(clear):

值:

none:默认值。允许两边都可以有浮动对象；

left:不允许左边有浮动对象；

right:不允许右边有浮动对象；

both:左右两侧不允许有浮动对象。

清除浮动的方法：

第一种:额外标签法

这种方法应该是最简单的一种了，w3c建议在容器的末尾增加一个“clear:both"的元素

强迫容器适应它的高度以便装下所有的float元素。

<div id="main">

　 <div id="left"></div>

　 <div id="right"></div>

　 <div class="clear"></div>

</div>

<div id="footer"></div>

.clear{clear:both;}

第二种：父元素添加overflow:hidden;

注：如果子元素使用了定位布局，就会很难实现。

第三种：利用伪对象after方法

定义一个类，使用伪对象after,控制浮动元素的影响。网上最流行的清除浮动代码：

.clearFix:after{

clear:both;

display:block;

visibility:hidden;

height:0;

line-height:0;

content:'';

}

.clearFix{zoom:1;} /*解决ie6/7兼容问题*/

css溢出的使用

设置对象的内容超过其指定高度及宽度时，如何管理内容。

overflow:visible【默认值，不剪切内容也不添加滚动条】

auto【在必需时，对象内容才会被剪切或添加滚动条】

hidden【不显示超过对象尺寸的内容】

scroll【总是显示滚动条】

zoom属性：只有ie内核的浏览器支持，缩放比例。

设置或检索对象的缩放比例。

语法：normal【默认值，使用对象的实际尺寸】；number【百分数|无符号浮点实数。浮点实数

为1.0或百分数为100%时相当于此属性的normal值

zoom:1解决ie6高度自适应问题。

每天进步一点点。

分类·技术相关评论(347) 浏览(9419) 2013-08-11

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