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		<title>用float精确定位div+css</title>
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		<pubDate>Sun, 31 Jan 2010 14:35:14 +0000</pubDate>
		<dc:creator>Key4ever</dc:creator>
				<category><![CDATA[前端]]></category>
		<category><![CDATA[div+css]]></category>
		<category><![CDATA[float属性]]></category>
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			<content:encoded><![CDATA[<p>用position的<strong>relative</strong>和<strong>absolute</strong>定位div不方便改动。用float就不折腾了，长宽定义不溢出就行了，float的详细可以<a href="http://www.w3school.com.cn/css/css_positioning_floating.asp">看这里</a>，里面的实例更清晰。详细代码和效果如下。</p>
<p><a href="http://www.key-4ever.com/wp-content/uploads/2010/01/float_css.jpg"><img class="alignnone size-medium wp-image-495" title="float_css" src="http://www.key-4ever.com/wp-content/uploads/2010/01/float_css-300x299.jpg" alt="" width="300" height="299" /></a><a href="http://www.key-4ever.com/wp-content/uploads/2010/01/css_float.jpg">&lt;-</a>点击看大图。</p>
<p>看起来每个div间都有<strong>2px</strong>距离，因为定义了边框border-width:1px，等同于div外加多一个<strong>1px</strong>，所以margin、height和width计算时像做小学计算题。以下是代码部分，两个文件放在同一文件夹就行了。</p>
<p><span id="more-488"></span></p>
<p>css代码部分，文件名style.css</p>
<pre style="background-color: #eeeeee; padding: 15px;">body{margin:0px auto;
padding:0px;
text-align:center;}
#all{margin:0px auto;
padding:0px;
width:800px;
height:800px;
border-style:solid;
border-width:10px;
background-color:#04a2e4;
}

#head{margin:2px 2px 1px;
padding:0px;
width:794px;
height:195px;
border-style:solid;
border-width:1px;
background-color:red;
}

#left{margin:1px 1px 1px 2px;
padding:0px;
float:left;
height:396px;
width:395px;
border-style:solid;
border-width:1px;
background-color:yellow;
}

#left1{margin:2px 2px 1px;
width:389px;
height:193px;
border-style:solid;
border-width:1px;
background-color:#ffffff;
}

#left2{margin:1px 2px 2px;
width:389px;
height:193px;
border-style:solid;
border-width:1px;
background-color:#ffffff;
}

#right{margin:1px 2px 1px 1px;
padding:0px;
width:395px;
height:396px;
float:left;
border-style:solid;
border-width:1px;
background-color:green;
}

#foot{margin:1px 2px 2px 2px;
padding:0px;
width:794px;
height:195px;
border-style:solid;
border-width:1px;
float:left;
background-color:#7d90e5;
}</pre>
<p>html代码部分</p>
<pre style="background-color: #eeeeee; padding: 15px;">&lt;!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"&gt;
&lt;html xmlns="http://www.w3.org/1999/xhtml"&gt;
&lt;head&gt;
&lt;title&gt;CSS&lt;/title&gt;
&lt;link rel="stylesheet" type="text/css" href="style.css" /&gt;
&lt;/head&gt;

&lt;body&gt;
&lt;div id="all"&gt;
&lt;div id="head"&gt;&lt;/div&gt;
&lt;div id="left"&gt;
&lt;div id="left1"&gt;&lt;/div&gt;
&lt;div id="left2"&gt;&lt;/div&gt;
&lt;/div&gt;
&lt;div id="right"&gt;&lt;/div&gt;
&lt;div id="foot"&gt;&lt;/div&gt;
&lt;/div&gt;
&lt;/body&gt;

&lt;/html&gt;</pre>
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