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由浅入深学习margin属性用法和特征

你对margin属性的用法和特征是否了解,这里和大家分享一下,属性margin可以用来同时设置box的四边外边距,而其他的margin属性只能设置其自各的外边距。

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由浅入深漫谈margin属性

margin在中文中我们翻译成外边距或者外补白(本文中引用外边距)。他是元素盒模型(boxmodel)的基础属性。

一、margin的基本特性

margin属性包括margin-top,margin-right,margin-bottom,margin-left,margin,可以用来设置box的marginarea。属性margin可以用来同时设置box的四边外边距,而其他的margin属性只能设置其自各的外边距。

margin属性可以应用于几乎所有的元素,除了表格显示类型(不包括table-caption,tableandinline-table)的元素,而且垂直外边距对非置换内联元素(non-replacedinlineelement)不起作用。

或许有朋友对非置换元素(non-replacedelement)有点疑惑,稍微帮助大家理解一下。非置换元素,W3C中没有给出明确的定义,但我们从字面可以理解到,非置换元素对应着置换元素(replacedelement),也就是说我们搞懂了置换元素的含义,就懂了非置换元素。置换元素,W3C中给出了定义:

◆引用:

“AnelementthatisoutsidethescopeoftheCSSformatter,suchasanimage,embeddeddocument,orapplet”
从定义中我们可以理解到,置换元素(replacedelement)主要是指img,input,textarea,select,object等这类默认就有CSS格式化外表范围的元素。进而可知,非置换元素(non-replacedelement)就是除了img,input,textarea,select,object等置换元素以外的元素。

margin始终是透明的。#p#

二、margin的基本写法

外边距的margin-width的值类型有:auto|length|percentage

percentage:百分比是由被应用box的containingblock(注:一个元素的containingblock是该元素产生的box(es)在计算位置和大小时参考的一个矩形,详细阅读可看:《ContainingBlock》)的大小所决定。对于margin-top和margin-bottom也同样成立。

margin的默认值为0,并且margin支持负值。

上面我们曾提到属性margin可以用来同时指定box的四边外边距。如果属性margin有四个值,那么值将按照上-右-下-左的顺序作用于四边,即从元素的上边开始,按照顺时针的顺序围绕元素。表达式如下:

margin:toprightbottomleft;
四个数值中间以空格分隔。效果等同于:

 
 
 
  1. margin-top:value;  
  2. margin-right:value;  
  3. margin-bottom:value;  
  4. margin-left:value;  
  5.  

并且规范还提供了省略的数值写法,基本原则如下:

◆引用:

1.如果没有left值,则使用right代替;

2.如果没有bottom值,则使用top代替;

3.如果没有right值,则使用top值代替。

根据这些基本原则,我们可以有三种省略方式,但不管怎样省略margin的数值都会大于等于一个,而margin的默认数值是从top开始至left结束,那么对于省略的具体情况,我们可以从left反推理回去。

1.如果margin只有三个值,按照值的顺序为margin:toprightbottom;缺少了left,根据原则,则left的值有right来代替。

margin:10px20px30px;就等于margin:10px20px30px20px;

2.如果margin只有两个值,按照值的顺序为margin:topright;缺少了bottom和left,根据原则left的值由right来代替,bottm的值由top来代替。

margin:10px20px;就等于margin:10px20px10px20px;

3.如果margin只有一个值,按照值的顺序为margin:top;缺少了bottom、left和right,根据原则left的值由right来代替,bottom的值由top来代替,right的值右top来代替,也就是说left的值也由top来代替。

margin:10px;就等于margin:10px10px10px10px;#p#

三、margin的解析逻辑

目前我们已经了解到了margin的基本特性和基本写法,但对元素margin的基本解析逻辑还是很模糊,到底margin的top、right、bottom、left都是以什么为基准来促使boxmodel形成。为了形象,易懂的对margin的逻辑进行说明,下面讲解的过程中,将引入W3C上没有的参考线的说法。何谓参考线?参考线就是margin移动的基准点,此基准点相对于box是静止的。而margin的数值,就是box相对于参考线的位移量。

margin中top、right、bottom、left的参考线并不一致为一类,而是分为了两类参考线,top和left的参考线属于一类,right和bottom的参考线属于另一类。那他们到底各以什么为参考线呢?top以containingblock的content上边或者垂直上方相连元素margin的下边为参考线垂直向下位移;left以containingblock的content左边或者水平左方相连元素margin的右边为参考线水平向右位移。right以元素本身的border右边为参考线水平向右位移;bottom以元素本身的border下边为参考线垂直向下位移。从上我们可以看到top和left都是以外元素为参考,而right和bottom以本元素为参考。上面的位移方向是指margin数值为正值时候的情形,如果是负值则位移方向相反。

或许理论听起来比较枯燥,我们举例说明一下:

 
 
 
  1.  
  2. "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> 
  3.  
  4.  
  5.  
  6. 无标题文档 title> </li> <li><styletypestyletype="text/css"> </li> <li>div{width:200px;height:200px;background:#ccc;}  </li> <li> style> </li> <li> head> </li> <li> </li> <li><body> </li> <li><div>外边距的margin-width的值类型有:auto|length|percentage div> </li> <li> body> </li> <li> html> </li> <li> </li> </ol></pre><p> </p><p>如上代码,很简单,为了方便我们看到效果,我们给div设置了宽度和高度以及背景色。</p><p>现在我们给div的样式加上<font>margin</font>属性,比如:</p><p><font>margin</font>:-10px20px-30px40px;</p><p>◆这时候<font>margin</font>的解析逻辑是怎样的呢?</p><p>首先我们要搞清div的和周边元素的关系,div没有相连元素,而此时div的containingblock是body产生的blockbox。则根据上面介绍的参考线原理,div的左外边距以containingblock的content左边为参考线,及此时以body的content左边为参考线进行水平向右位移,位移的大小为40px,同理,上边距以body的content上边为参考线进行垂直向上位移10px(负值和正值的方向相反),下边距依照现在div的borer下边(此时的div已经经过上边距位移过了)垂直向上位移30px(此时,<font>margin</font>不会改变box的border内的物理大小,但会改变box的逻辑大小,即:以此box的<font>margin</font>的下边为参考的元素,不是从box的物理位置开始的,而是从逻辑位置开始),右边距依照现在div的borer右边(此时的div已经经过左边距位移过了)水平向右位移20px。</p><p>或许有朋友问你分析的顺序怎么和<font>margin</font>表达式中出现的顺序不一样?如果按照<font>margin</font>表达式中出现的顺序来分析,结果是一样的,只是为了更好的方便大家的理解而没有按照表达式的顺序来分析。</p><p>用<font>margin</font>***的实际显示大小的到底是怎么样呢,或许有朋友也比较疑惑,我暂时用逻辑大小和物理大小来区分(其实上面已用到此概念),到底什么是逻辑大小,什么是物理大小呢?!具体可以看图,物理大小指的是除去<font>margin</font>,也就是包含border以内的box大小,而逻辑大小,则是box通过<font>margin</font>解析规则解析后得到的大小(这或许可以解释为什么IE5会错误解析盒模型)。在上图中,box的实际显示的宽度等于box的逻辑大小,而box实际显示的高度等于box的物理大小,这说明box实际显示的大小可能是box的逻辑大小,也可能是box的物理大小,规则到底是怎样的——</p><p>box的实际大小=box的物理大小+正的<font>margin</font></p><p>这仅对元素本身有效,对于其后面的相关元素,他们则只以<font>margin</font>的逻辑大小为准则,进行布局。</p><p>有朋友反应,听得很迷糊,越看越不懂,如果你对具体的理解过程不感兴趣的话,那记住下面我总结的结论就可以了,XD</p><p><strong>结论:</strong></p><p>box***的显示大小等于box的border及border内的大小加上正的<font>margin</font>值。而负的<font>margin</font>值不会影响box的实际大小,如果是负的top或left值会引起box的向上或向左位置移动,如果是bottom或right只会影响下面box的显示的参考线。</p> 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style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">D:\wwwroot\hd19\wwwroot\ThinkPHP\Library\Think\App.class.php ( 13.49 KB )</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">D:\wwwroot\hd19\wwwroot\ThinkPHP\Library\Think\Dispatcher.class.php ( 14.79 KB )</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">D:\wwwroot\hd19\wwwroot\ThinkPHP\Library\Think\Route.class.php ( 13.36 KB )</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">D:\wwwroot\hd19\wwwroot\ThinkPHP\Library\Think\Controller.class.php ( 11.23 KB )</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">D:\wwwroot\hd19\wwwroot\ThinkPHP\Library\Think\View.class.php ( 7.59 KB )</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">D:\wwwroot\hd19\wwwroot\ThinkPHP\Library\Behavior\BuildLiteBehavior.class.php ( 3.68 KB )</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">D:\wwwroot\hd19\wwwroot\ThinkPHP\Library\Behavior\ParseTemplateBehavior.class.php ( 3.88 KB )</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">D:\wwwroot\hd19\wwwroot\ThinkPHP\Library\Behavior\ContentReplaceBehavior.class.php ( 1.91 KB )</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">D:\wwwroot\hd19\wwwroot\ThinkPHP\Conf\convention.php ( 11.15 KB )</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">D:\wwwroot\hd19\wwwroot\App\Common\Conf\config.php ( 1.78 KB )</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">D:\wwwroot\hd19\wwwroot\ThinkPHP\Lang\zh-cn.php ( 2.55 KB )</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">D:\wwwroot\hd19\wwwroot\ThinkPHP\Conf\debug.php ( 1.50 KB )</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">D:\wwwroot\hd19\wwwroot\App\Home\Conf\config.php ( 0.38 KB )</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">D:\wwwroot\hd19\wwwroot\App\Home\Common\function.php ( 3.33 KB )</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">D:\wwwroot\hd19\wwwroot\ThinkPHP\Library\Behavior\ReadHtmlCacheBehavior.class.php ( 5.62 KB )</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">D:\wwwroot\hd19\wwwroot\App\Home\Controller\ArticleController.class.php ( 5.69 KB )</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">D:\wwwroot\hd19\wwwroot\App\Home\Controller\CommController.class.php ( 0.14 KB )</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">D:\wwwroot\hd19\wwwroot\ThinkPHP\Library\Think\Model.class.php ( 60.11 KB )</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">D:\wwwroot\hd19\wwwroot\ThinkPHP\Library\Think\Db.class.php ( 32.43 KB )</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">D:\wwwroot\hd19\wwwroot\ThinkPHP\Library\Think\Db\Driver\Pdo.class.php ( 16.74 KB )</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">D:\wwwroot\hd19\wwwroot\ThinkPHP\Library\Think\Cache.class.php ( 3.83 KB )</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">D:\wwwroot\hd19\wwwroot\ThinkPHP\Library\Think\Cache\Driver\File.class.php ( 5.87 KB )</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">D:\wwwroot\hd19\wwwroot\ThinkPHP\Library\Think\Template.class.php ( 28.16 KB )</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">D:\wwwroot\hd19\wwwroot\ThinkPHP\Library\Think\Template\TagLib\Cx.class.php ( 22.40 KB )</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">D:\wwwroot\hd19\wwwroot\ThinkPHP\Library\Think\Template\TagLib.class.php ( 9.16 KB )</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">D:\wwwroot\hd19\wwwroot\App\Runtime\Cache\Home\7540f392f42b28b481b30614275e4e55.php ( 11.02 KB )</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">D:\wwwroot\hd19\wwwroot\ThinkPHP\Library\Behavior\WriteHtmlCacheBehavior.class.php ( 0.97 KB )</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">D:\wwwroot\hd19\wwwroot\ThinkPHP\Library\Behavior\ShowPageTraceBehavior.class.php ( 5.24 KB )</li> </ol> </div> <div style="display:none;"> <ol style="padding: 0; margin:0"> <li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">[ app_init ] --START--</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">Run Behavior\BuildLiteBehavior [ RunTime:0.000010s ]</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">[ app_init ] --END-- [ RunTime:0.000042s ]</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">[ app_begin ] --START--</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">Run Behavior\ReadHtmlCacheBehavior [ RunTime:0.000151s ]</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">[ app_begin ] --END-- [ RunTime:0.000180s ]</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">[ view_parse ] --START--</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">[ template_filter ] --START--</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">Run Behavior\ContentReplaceBehavior [ RunTime:0.000099s ]</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">[ template_filter ] --END-- [ RunTime:0.000126s ]</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">Run Behavior\ParseTemplateBehavior [ RunTime:0.003108s ]</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">[ view_parse ] --END-- [ RunTime:0.003147s ]</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">[ view_filter ] --START--</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">Run Behavior\WriteHtmlCacheBehavior [ RunTime:0.000172s ]</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">[ view_filter ] --END-- [ RunTime:0.000213s ]</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">[ app_end ] --START--</li> </ol> </div> <div style="display:none;"> <ol style="padding: 0; margin:0"> <li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">1064:You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ') LIMIT 1' at line 1 [ SQL语句 ] : SELECT `id`,`pid`,`navname` FROM `cx_nav` WHERE ( id= ) LIMIT 1 </li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">1064:You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ') LIMIT 1' at line 1 [ SQL语句 ] : SELECT `id`,`navname` FROM `cx_nav` WHERE ( id= ) LIMIT 1 </li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">1064:You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ')' at line 1 [ SQL语句 ] : SELECT `id`,`navname` FROM `cx_nav` WHERE ( pid= ) </li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">[8] Undefined index: pid D:\wwwroot\hd19\wwwroot\App\Home\Controller\ArticleController.class.php 第 47 行.</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">[2] mkdir(): Permission denied D:\wwwroot\hd19\wwwroot\ThinkPHP\Library\Think\Cache\Driver\File.class.php 第 59 行.</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">[2] mkdir(): Permission denied D:\wwwroot\hd19\wwwroot\ThinkPHP\Library\Think\Cache\Driver\File.class.php 第 59 行.</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">[2] file_put_contents(./App/Runtime/Temp/0/005f2c46e098d39cc4f1297ef7c73901.php): failed to open stream: No such file or directory D:\wwwroot\hd19\wwwroot\ThinkPHP\Library\Think\Cache\Driver\File.class.php 第 132 行.</li> </ol> </div> <div style="display:none;"> <ol style="padding: 0; margin:0"> <li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">DESCRIBE qt_article [ RunTime:0.001287s ]</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">SELECT * FROM `qt_article` WHERE ( name='dhsigep' ) LIMIT 1 [ RunTime:0.003078s ]</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">DESCRIBE cx_nav [ RunTime:0.000564s ]</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">SELECT `id`,`pid`,`navname` FROM `cx_nav` WHERE ( id= ) LIMIT 1 [ RunTime:0.000113s ]</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">SELECT `id`,`navname` FROM `cx_nav` WHERE ( id= ) LIMIT 1 [ RunTime:0.000102s ]</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">SELECT `id`,`navname` FROM `cx_nav` WHERE ( pid= ) [ RunTime:0.000072s ]</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">SELECT `id`,`name`,`biaoji`,`title` FROM `qt_article` ORDER BY biaoji asc LIMIT 30 [ RunTime:0.002274s ]</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">UPDATE `qt_article` SET `biaoji`=biaoji+1 WHERE ( id=1850715 ) [ RunTime:0.000920s ]</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">UPDATE `qt_article` SET `biaoji`=biaoji+1 WHERE ( id=1850691 ) [ RunTime:0.001205s ]</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">UPDATE `qt_article` SET `biaoji`=biaoji+1 WHERE ( id=1850706 ) [ RunTime:0.000834s ]</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">UPDATE `qt_article` SET `biaoji`=biaoji+1 WHERE ( id=1850684 ) [ RunTime:0.000866s ]</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">UPDATE `qt_article` SET `biaoji`=biaoji+1 WHERE ( id=1850713 ) [ RunTime:0.001553s ]</li> </ol> </div> <div style="display:none;"> <ol style="padding: 0; margin:0"> </ol> </div> </div> </div> <div id="think_page_trace_close" style="display:none;text-align:right;height:15px;position:absolute;top:10px;right:12px;cursor: pointer;"><img style="vertical-align:top;" 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