line-height属性值为百分比和数字乘积因子的区别_html/css

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line-height属性值为百分比和数字乘积因子的区别_html/css_WEB-ITnose

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Jun 24, 2016 am 11:28 AM

line-height属性值为百分比和数字乘积因子的区别:
本章节不对line-height属性的具体用法做介绍，只介绍参数为百分比和数字乘积因子时候的区别。
关于line-height的基本用法可以参阅line-height属性深入介绍一章节。
当设置line-height属性值为百分比和数字乘积因子的时候有点类似，比如200%和2都可以将line-height属性值设置为当前元素内字体大小的两倍，是不是感觉使用两种方式参数值有点多此一举，其实并非如此。
看如下代码实例:

<!DOCTYPE html><html><head><meta charset=" utf-8"><meta name="author" content="http://www.softwhy.com/" /><title>蚂蚁部落</title><style type="text/css">#top{  width:300px;  background:#CCC;  line-height:2;  font-size:12px;  margin:5px;}#top .inner{  font-size:18px;}#bottom{  width:300px;  background:#CCC;  line-height:200%;  font-size:12px;  margin:5px;}#bottom .inner{  font-size:18px;}</style></head><body><div id="top">  <div class="inner">蚂蚁部落一</div></div><div id="bottom">  <div class="inner">蚂蚁部落二</div></div></body></html>

上面的代码中，上下两个的行高很明显是有差距的，下面就介绍一下它们两者的区别。
当使用百分比的时候，就会根据当前元素的字体大小计算出line-height，这个时候行高就固定了，下面子元素就继承这个固定的行高，比如上面的代码中，顶部外城div通过百分比计算出行高为24px，那么它的子元素就会继承这个固定值，而不会再根据子元素的字体计算。当使用数字乘积因子的时候，子元素继承的是这个因子，所以会根据子元素的字体大小计算行高。

原文地址是:http://www.softwhy.com/forum.php?mod=viewthread&tid=15900

更多内容可以参阅:http://www.softwhy.com/divcss/

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