你真的懂float吗
<p style="margin-top: 18px; margin-bottom: 18px; color: rgb(51, 51, 51); font-family: "helvetica neue", tahoma, "hiragino sans gb", stheiti, "wenquanyi micro hei", 微软雅黑, 宋体, sans-serif; font-size: 16px; line-height: 27.2px;">你真的懂float吗？</p><h2 style="font-size: 26px; margin-top: 20px; margin-bottom: 20px; counter-reset: section 0; font-weight: normal; color: rgb(51, 51, 51); font-family: "helvetica neue", tahoma, "hiragino sans gb", stheiti, "wenquanyi micro hei", 微软雅黑, 宋体, sans-serif;">前言</h2><p style="margin-top: 18px; margin-bottom: 18px; color: rgb(51, 51, 51); font-family: "helvetica neue", tahoma, "hiragino sans gb", stheiti, "wenquanyi micro hei", 微软雅黑, 宋体, sans-serif; font-size: 16px; line-height: 27.2px;">相信很多人都用过float属性，也知道float是干嘛的，但是在实际项目中有时候用起来往往不是想象中的结果，或者对为什么出现这样的结果不理解。<br>现在我也来浅谈一下float相关的事情，<br>请大家不要吐槽，积极给予我掌声，我会表面拒绝的，然后内心欣然接受你们的掌声。</p><h2 style="font-size: 26px; margin-top: 20px; margin-bottom: 20px; counter-reset: section 0; font-weight: normal; color: rgb(51, 51, 51); font-family: "helvetica neue", tahoma, "hiragino sans gb", stheiti, "wenquanyi micro hei", 微软雅黑, 宋体, sans-serif;">属性列表</h2><p style="margin-top: 18px; margin-bottom: 18px; color: rgb(51, 51, 51); font-family: "helvetica neue", tahoma, "hiragino sans gb", stheiti, "wenquanyi micro hei", 微软雅黑, 宋体, sans-serif; font-size: 16px; line-height: 27.2px;">float有四个属性，具体属性的意思我就不说了，不懂的通过传送门去查看：<a href="http://www.w3school.com.cn/cssref/pr" target="_blank" style="text-decoration: none; color: rgb(49, 135, 219);">传送门</a></p><pre style="font-family: consolas, monaco, menlo, "courier new", courier, monospace; border: 1px solid rgb(221, 221, 221); font-size: 12px; line-height: 18px; overflow: auto; padding: 6px 10px; border-radius: 3px; word-break: break-all; color: rgb(51, 51, 51); background-color: rgb(248, 248, 248);"><code style="font-family: consolas, monaco, menlo, "courier new", courier, monospace; display: inline-block; line-height: 1.5; border: 0px none; border-radius: 0px; font-size: inherit; background: none;">.xxx {float: left | right | inherit | none
}
</code></pre><h2 style="font-size: 26px; margin-top: 20px; margin-bottom: 20px; counter-reset: section 0; font-weight: normal; color: rgb(51, 51, 51); font-family: "helvetica neue", tahoma, "hiragino sans gb", stheiti, "wenquanyi micro hei", 微软雅黑, 宋体, sans-serif;">浮动元素显示规则</h2><h4 style="font-size: 18px; color: rgb(51, 51, 51); font-family: "helvetica neue", tahoma, "hiragino sans gb", stheiti, "wenquanyi micro hei", 微软雅黑, 宋体, sans-serif;">1、对于它的父元素来说，浮动元素是不存在的</h4><p style="margin-top: 18px; margin-bottom: 18px; color: rgb(51, 51, 51); font-family: "helvetica neue", tahoma, "hiragino sans gb", stheiti, "wenquanyi micro hei", 微软雅黑, 宋体, sans-serif; font-size: 16px; line-height: 27.2px;">一个元素如果仅仅有一个浮动元素为子元素的话，父元素的宽高会收起来（浮动元素不会撑起父元素的宽高）：</p><p style="margin-top: 18px; margin-bottom: 18px; color: rgb(51, 51, 51); font-family: "helvetica neue", tahoma, "hiragino sans gb", stheiti, "wenquanyi micro hei", 微软雅黑, 宋体, sans-serif; font-size: 16px; line-height: 27.2px;">例子1-1：</p><pre style="font-family: consolas, monaco, menlo, "courier new", courier, monospace; border: 1px solid rgb(221, 221, 221); font-size: 12px; line-height: 18px; overflow: auto; padding: 6px 10px; border-radius: 3px; word-break: break-all; color: rgb(51, 51, 51); background-color: rgb(248, 248, 248);"><code style="font-family: consolas, monaco, menlo, "courier new", courier, monospace; display: inline-block; line-height: 1.5; border: 0px none; border-radius: 0px; font-size: inherit; background: none;">.parent {
position: relative;
padding: 10px;
}
.child {
float: left
}
</code></pre><p style="margin-top: 18px; margin-bottom: 18px; color: rgb(51, 51, 51); font-family: "helvetica neue", tahoma, "hiragino sans gb", stheiti, "wenquanyi micro hei", 微软雅黑, 宋体, sans-serif; font-size: 16px; line-height: 27.2px;"><img src="http://divio.qiniudn.com/FlqQ8Vi4_PVQtCGcyDuR_8nDJO_i" alt="" style="max-width: 50em; margin-top: 1em; margin-bottom: 1em;"></p><h4 style="font-size: 18px; color: rgb(51, 51, 51); font-family: "helvetica neue", tahoma, "hiragino sans gb", stheiti, "wenquanyi micro hei", 微软雅黑, 宋体, sans-serif;">2、一个浮动元素的位置会尽可能的靠近他父元素的左上角或者右上角</h4><p style="margin-top: 18px; margin-bottom: 18px; color: rgb(51, 51, 51); font-family: "helvetica neue", tahoma, "hiragino sans gb", stheiti, "wenquanyi micro hei", 微软雅黑, 宋体, sans-serif; font-size: 16px; line-height: 27.2px;">float: left的元素会尽量靠近父元素的左上角<br>float: right的元素会尽量靠近父元素的右上角<br>例子2-1：</p><p style="margin-top: 18px; margin-bottom: 18px; color: rgb(51, 51, 51); font-family: "helvetica neue", tahoma, "hiragino sans gb", stheiti, "wenquanyi micro hei", 微软雅黑, 宋体, sans-serif; font-size: 16px; line-height: 27.2px;"><img src="http://divio.qiniudn.com/FilH4MZJfz1cz_lWFC4b1rwJgmz0" alt="" style="max-width: 50em; margin-top: 1em; margin-bottom: 1em;"></p><h4 style="font-size: 18px; color: rgb(51, 51, 51); font-family: "helvetica neue", tahoma, "hiragino sans gb", stheiti, "wenquanyi micro hei", 微软雅黑, 宋体, sans-serif;">3、 浮动元素前面定义的元素会把浮动元素挤到下面</h4><p style="margin-top: 18px; margin-bottom: 18px; color: rgb(51, 51, 51); font-family: "helvetica neue", tahoma, "hiragino sans gb", stheiti, "wenquanyi micro hei", 微软雅黑, 宋体, sans-serif; font-size: 16px; line-height: 27.2px;">尽管浮动元素会尽可能的靠近父元素的左上角或者右上角（规则2），但是如果浮动元素前面有相邻元素的话，不管是inline（宽度大于父元素的时候）的或者block的，都会把浮动元素挤到下面。</p><p style="margin-top: 18px; margin-bottom: 18px; color: rgb(51, 51, 51); font-family: "helvetica neue", tahoma, "hiragino sans gb", stheiti, "wenquanyi micro hei", 微软雅黑, 宋体, sans-serif; font-size: 16px; line-height: 27.2px;">例子3-1：浮动元素前面无元素的情况：</p><p style="margin-top: 18px; margin-bottom: 18px; color: rgb(51, 51, 51); font-family: "helvetica neue", tahoma, "hiragino sans gb", stheiti, "wenquanyi micro hei", 微软雅黑, 宋体, sans-serif; font-size: 16px; line-height: 27.2px;"><img src="http://divio.qiniudn.com/FrN21Ehyn9XDWdn_oI1xHfknAeNv" alt="" style="max-width: 50em; margin-top: 1em; margin-bottom: 1em;"></p><p style="margin-top: 18px; margin-bottom: 18px; color: rgb(51, 51, 51); font-family: "helvetica neue", tahoma, "hiragino sans gb", stheiti, "wenquanyi micro hei", 微软雅黑, 宋体, sans-serif; font-size: 16px; line-height: 27.2px;">例子3-2：浮动元素前面有元素的情况：</p><p style="margin-top: 18px; margin-bottom: 18px; color: rgb(51, 51, 51); font-family: "helvetica neue", tahoma, "hiragino sans gb", stheiti, "wenquanyi micro hei", 微软雅黑, 宋体, sans-serif; font-size: 16px; line-height: 27.2px;"><img src="http://divio.qiniudn.com/FmUocHEDQjjEs4vKw9G5UOgxSx2Q" alt="" style="max-width: 50em; margin-top: 1em; margin-bottom: 1em;"></p><h4 style="font-size: 18px; color: rgb(51, 51, 51); font-family: "helvetica neue", tahoma, "hiragino sans gb", stheiti, "wenquanyi micro hei", 微软雅黑, 宋体, sans-serif;">4、先声明的浮动元素有优先靠近父元素左上角或者右上角（规则2）位置的权利</h4><p style="margin-top: 18px; margin-bottom: 18px; color: rgb(51, 51, 51); font-family: "helvetica neue", tahoma, "hiragino sans gb", stheiti, "wenquanyi micro hei", 微软雅黑, 宋体, sans-serif; font-size: 16px; line-height: 27.2px;">如果一个父元素有多个浮动子元素，前面声明的浮动元素会更靠近父元素的左上角或者右上角</p><p style="margin-top: 18px; margin-bottom: 18px; color: rgb(51, 51, 51); font-family: "helvetica neue", tahoma, "hiragino sans gb", stheiti, "wenquanyi micro hei", 微软雅黑, 宋体, sans-serif; font-size: 16px; line-height: 27.2px;">例子4-1：有三个浮动子元素的情况</p><pre style="font-family: consolas, monaco, menlo, "courier new", courier, monospace; border: 1px solid rgb(221, 221, 221); font-size: 12px; line-height: 18px; overflow: auto; padding: 6px 10px; border-radius: 3px; word-break: break-all; color: rgb(51, 51, 51); background-color: rgb(248, 248, 248);"><code style="font-family: consolas, monaco, menlo, "courier new", courier, monospace; display: inline-block; line-height: 1.5; border: 0px none; border-radius: 0px; font-size: inherit; background: none;"><div class="container">
<div class="right">1</div>
<div class="right">2</div>
<div class="right">3</div>
<p>Lorem ipsum dolor sit amet, consectetur adipiscing elit</p>
</div>
</code></pre><p style="margin-top: 18px; margin-bottom: 18px; color: rgb(51, 51, 51); font-family: "helvetica neue", tahoma, "hiragino sans gb", stheiti, "wenquanyi micro hei", 微软雅黑, 宋体, sans-serif; font-size: 16px; line-height: 27.2px;"><img src="http://divio.qiniudn.com/FkgIiCTKaQRGQghLnbS7md9A4VpH" alt="" style="max-width: 50em; margin-top: 1em; margin-bottom: 1em;"></p><h4 style="font-size: 18px; color: rgb(51, 51, 51); font-family: "helvetica neue", tahoma, "hiragino sans gb", stheiti, "wenquanyi micro hei", 微软雅黑, 宋体, sans-serif;">5、规则2的拓展</h4><p style="margin-top: 18px; margin-bottom: 18px; color: rgb(51, 51, 51); font-family: "helvetica neue", tahoma, "hiragino sans gb", stheiti, "wenquanyi micro hei", 微软雅黑, 宋体, sans-serif; font-size: 16px; line-height: 27.2px;">如果有多个相同方向的浮动元素，浮动元素也会尽可能的靠近左上角或者右上角，直到父元素宽度没法放下这个元素的时候，这个元素才会被挤下去。<br>例子5-1： <img src="http://divio.qiniudn.com/FujHBgGERUvBWdNmUORNUdm0euZl" alt="" style="max-width: 50em; margin-top: 1em; margin-bottom: 1em;"></p><h4 style="font-size: 18px; color: rgb(51, 51, 51); font-family: "helvetica neue", tahoma, "hiragino sans gb", stheiti, "wenquanyi micro hei", 微软雅黑, 宋体, sans-serif;">6、inline元素添加浮动属性会拥有block特性</h4><p style="margin-top: 18px; margin-bottom: 18px; color: rgb(51, 51, 51); font-family: "helvetica neue", tahoma, "hiragino sans gb", stheiti, "wenquanyi micro hei", 微软雅黑, 宋体, sans-serif; font-size: 16px; line-height: 27.2px;">可以添加宽高等。</p><h4 style="font-size: 18px; color: rgb(51, 51, 51); font-family: "helvetica neue", tahoma, "hiragino sans gb", stheiti, "wenquanyi micro hei", 微软雅黑, 宋体, sans-serif;">7、浮动元素不会跑出父元素的边界</h4><p style="margin-top: 18px; margin-bottom: 18px; color: rgb(51, 51, 51); font-family: "helvetica neue", tahoma, "hiragino sans gb", stheiti, "wenquanyi micro hei", 微软雅黑, 宋体, sans-serif; font-size: 16px; line-height: 27.2px;">这里是相对来说的，float:left元素不会跑出到父元素左边界的外面，不像position: absolute元素可以跑到父元素的外面。</p><p style="margin-top: 18px; margin-bottom: 18px; color: rgb(51, 51, 51); font-family: "helvetica neue", tahoma, "hiragino sans gb", stheiti, "wenquanyi micro hei", 微软雅黑, 宋体, sans-serif; font-size: 16px; line-height: 27.2px;">例子7-1： <img src="http://divio.qiniudn.com/Fht_Lq-_Eqqo5E6mOWdgF2lXrv-g" alt="" style="max-width: 50em; margin-top: 1em; margin-bottom: 1em;"></p><h4 style="font-size: 18px; color: rgb(51, 51, 51); font-family: "helvetica neue", tahoma, "hiragino sans gb", stheiti, "wenquanyi micro hei", 微软雅黑, 宋体, sans-serif;">8、clear（清除浮动）扩展阅读</h4><p style="margin-top: 18px; margin-bottom: 18px; color: rgb(51, 51, 51); font-family: "helvetica neue", tahoma, "hiragino sans gb", stheiti, "wenquanyi micro hei", 微软雅黑, 宋体, sans-serif; font-size: 16px; line-height: 27.2px;">clear属性的详解：<a href="http://www.w3school.com.cn/cssref/pr" target="_blank" style="text-decoration: none; color: rgb(49, 135, 219);">传送门</a></p><p style="margin-top: 18px; margin-bottom: 18px; color: rgb(51, 51, 51); font-family: "helvetica neue", tahoma, "hiragino sans gb", stheiti, "wenquanyi micro hei", 微软雅黑, 宋体, sans-serif; font-size: 16px; line-height: 27.2px;"><br></p><p style="margin-top: 18px; margin-bottom: 18px; color: rgb(51, 51, 51); font-family: "helvetica neue", tahoma, "hiragino sans gb", stheiti, "wenquanyi micro hei", 微软雅黑, 宋体, sans-serif; font-size: 16px; line-height: 27.2px;">来源：http://div.io/topic/1278</p><p></p>
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