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float : none | left | right

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none :£  ĬÈÏÖµ¡£¶ÔÏó²»Æ®¸¡
left :£  Îı¾Á÷Ïò¶ÔÏóµÄÓÒ±ß
right :£  Îı¾Á÷Ïò¶ÔÏóµÄ×ó±ß

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xhtml:

<div id="warp">
 <div id="column1">ÕâÀïÊǵÚÒ»ÁÐ</div>
 <div id="column2">ÕâÀïÊǵڶþÁÐ</div>
 <div class="clear"></div>
</div>

CSS:

#wrap{ width:100%; height:auto;}
#column1{ float:left; width:40%;}
#column2{ float:right; width:60%;}
.clear{ clear:both;}

position : static | absolute | fixed | relative

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static :£  ĬÈÏÖµ¡£ÎÞÌØÊⶨ룬¶ÔÏó×ñÑ­HTML¶¨Î»¹æÔò
absolute :£  ½«¶ÔÏó´ÓÎĵµÁ÷ÖÐÍϳö£¬Ê¹Óà left £¬ right £¬ top £¬ bottom µÈÊôÐÔÏà¶ÔÓÚÆä×î½Ó½üµÄÒ»¸ö×îÓж¨Î»ÉèÖõĸ¸¶ÔÏó½øÐоø¶Ô¶¨Î»¡£Èç¹û²»´æÔÚÕâÑùµÄ¸¸¶ÔÏó£¬ÔòÒÀ¾Ý body ¶ÔÏ󡣶øÆä²ãµþͨ¹ý z-index ÊôÐÔ¶¨Òå
fixed :£  δ֧³Ö¡£¶ÔÏó¶¨Î»×ñ´Ó¾ø¶Ô(absolute)·½Ê½¡£µ«ÊÇÒª×ñÊØһЩ¹æ·¶
relative :£  ¶ÔÏ󲻿ɲãµþ£¬µ«½«ÒÀ¾Ý left £¬ right £¬ top £¬ bottom µÈÊôÐÔÔÚÕý³£ÎĵµÁ÷ÖÐÆ«ÒÆλÖÃ

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xhtml:

<div id="warp">
 <div id="column1">ÕâÀïÊǵÚÒ»ÁÐ</div>
 <div id="column2">ÕâÀïÊǵڶþÁÐ</div>
</div>

CSS:

#wrap{ position:relative;/*Ïà¶Ô¶¨Î»*/width:770px;}
#column1{ position:absolute; top:0; left:0; width:300px;}
#column2{position:absolute; top:0; right:0; width:470px;}

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