CSS的margin用法详解:
建议:尽可能的手写代码，可以有效的提高学习效率和深度。
margin属性在网页中使用非常的频繁，所以这里详细介绍一下此属性的用法。
此属性用来定义对象的外边距的，也称之为外补白，所谓的外边距就是围绕边框外侧的空白区域。可以单独定义上下左右某一方位的外边距。代码实例如下:
实例一:
子div没有外边距的情况：
<!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">.parent{ width:400px; height:400px; border:1px solid red;}.children{ width:100px; height:100px; border:1px solid green;}</style></head><body><div class="parent"> <div class="children"></div></div></body></html> 实例二:
设置了左边距以后子div:
<!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">.parent{ width:400px; height:400px; border:1px solid red;}.children{ width:100px; height:100px; border:1px solid green; margin-left:20px;}</style></head><body><div class="parent"> <div class="children"></div></div></body></html> 以上代码设置了子div的左外边距，这样就是比较清晰的明白外边距的意思了。
当然我们可以通过margin-right、margin-top和margin-bottom设置各自方位的外边距。虽然通过各自方位的外边属性设置外边距比较明确，但是也略显冗余，所以可以使用margin属性一次性设置多个方位的外边距。代码实例如下:
<!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">.parent{ width:400px; height:400px; border:1px solid red;}.children{ width:100px; height:100px; border:1px solid green; margin:20px 30px 50px 50px;}</style></head><body><div class="parent"> <div class="children"></div></div></body></html> 以上代码中通过使用margin属性一次性设置了对象的四个外边距。
下面是margin属性值的作用特点:
如果提供全部四个参数值，将按上、右、下、左的顺序作用于四边。
如果只提供一个，将用于全部的四边。
如果提供两个，第一个用于上、下，第二个用于左、右。
如果提供三个，第一个用于上，第二个用于左、右，第三个用于下。
原文地址是:http://www.softwhy.com/forum.php?mod=viewthread&tid=4657
更多内容可以参阅:http://www.softwhy.com/divcss/
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