OOCN分享圈 » 免费资源 » 10个CSS简写/优化技巧

oocn 发表于 2017-2-10 14:04

10个CSS简写/优化技巧

CSS简写就是指将多行的CSS属性简写成一行，又称为CSS代码优化或CSS缩写。CSS简写的最大好处就是能够显著减少CSS文件的大小，优化网站整体性能，更加容易阅读。

下面介绍常见的CSS简写规则：

一、盒子大小
这里主要用于两个属性：margin和padding，我们以margin为例，padding与之相同。盒子有上下左右四个方向，每个方向都有个外边距：[code]1
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margin-top:1px;
margin-right:2px;
margin-bottom:3px;
margin-left:4px;
你可以简写成：

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margin:1px 2px 3px 4px;
语法 margin:top right bottom left;

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//四个方向的边距相同，等同于margin:1px 1px 1px 1px;
margin:1px;
//上下边距都为1px，左右边距均为2px，等同于margin:1px 2px 1px 2px;
margin:1px 2px;
//右边距和左边距相同，等同于margin:1px 2px 3px 2px;
margin:1px 2px 3px;
//注意，这里虽然上下边距都为1px，但是这里不能缩写。
margin:1px 2px 1px 3px;
二、边框(border)

边框的属性如下：

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border-width:1px;
border-style:solid;
border-color:#000;
可以缩写为一句：

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border:1px solid #000;
语法 border:width style color;

三、背景(Backgrounds)
背景的属性如下：

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background-color:#f00;
background-image:url(background.gif);
background-repeat:no-repeat;
background-attachment:fixed;
background-position:00;
可以缩写为一句：

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background:#f00 url(background.gif) no-repeat fixed 0 0;
语法是background:color image repeat attachment position;
你可以省略其中一个或多个属性值，如果省略，该属性值将用浏览器默认值，默认值为：

color: transparent

image: none

repeat: repeat

attachment: scroll

position: 0% 0%

四、字体(fonts)
字体的属性如下：

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font-style:italic;
font-variant:small-caps;
font-weight:bold;font-size:1em;
line-height:140%;
font-family:"Lucida Grande",sans-serif;
可以缩写为一句：

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font:italic small-caps bold 1em/140%"Lucida Grande",sans-serif;
注意，如果你缩写字体定义，至少要定义font-size和font-family两个值。

五、列表(lists)
取消默认的圆点和序号可以这样写list-style:none;,
list的属性如下:

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list-style-type:square;
list-style-position:inside;
list-style-image:url(image.gif);
可以缩写为一句：

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list-style:square inside url(image.gif);
六、颜色(Color)

16进制的色彩值，如果每两位的值相同，可以缩写一半。例如：

Aqua: #00ffff ——#0ff
Black: #000000 ——#000
Blue: #0000ff ——#00f
Dark Grey: #666666 ——#666
Fuchsia:#ff00ff ——#f0f
Light Grey: #cccccc ——#ccc
Lime: #00ff00 ——#0f0
Orange: #ff6600 ——#f60
Red: #ff0000 ——#f00
White: #ffffff ——#fff
Yellow: #ffff00 ——#ff0

七、属性值为0
书写原则是如果CSS属性值为0，那么你不必为其添加单位(如:px/em)，你可能会这样写:

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padding:10px 5px 0px 0px;
试试这样吧:

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padding:10px 5px 00 ;
八、最后一个分号

最后一个属性值后面分号可以不写，如：

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#nav{
border-top:4px solid #333;
font-style: normal;
font-variant:normal;
font-weight: normal;
}
可以简写成:

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#nav{
border-top:4px solid #333;
font-style: normal;
font-variant:normal;
font-weight: normal
}
九、字体粗细(font-weight)

你可能会这样写:

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h1{
font-weight:bold;
}
p{
font-weight:normal;
}
可以简写成:

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h1{
font-weight:700;
}
p{
font-weight:400;
}
十、圆角半径(border-radius)
border-radius是css3中新加入的属性，用来实现圆角边框。

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-moz-border-radius-bottomleft:6px;
-moz-border-radius-topleft:6px;
-moz-border-radius-topright:6px;
-webkit-border-bottom-left-radius:6px;
-webkit-border-top-left-radius:6px;
-webkit-border-top-right-radius:6px;
border-bottom-left-radius:6px;
border-top-left-radius:6px;
border-top-right-radius:6px;
可以简写成:

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-moz-border-radius:6px 6px 0;
-webkit-border-radius:6px 6px 0;
border-radius:6px 6px 0;
语法 border-radius:topleft topright bottomright bottomleft[/code]

倾情 发表于 2017-2-17 22:03

[quote]他[她]看完这篇文章说：[img]http://oocn.258club.com/attachments/month_1412/14120408339fa81fa2b9de7e74.png[/img][/quote]

打的赢 发表于 2023-10-23 11:30

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{2023年10月01日}2023冬季，全球 崩 盘，三 峡 溃 坝

{2023年10月01曰}2023冬季，全球 崩 盘，三 峡 溃 坝



作者 ： 薛桦镰
时间：  2023年10月01曰 О8:49:57        星期曰        农历八月十七
           上正宗指 3110.48点    恒指 17809.66点   道指33507.50点
           囯际音乐节      囯际老人节
           


         
突然的，全球 金 融 市 场 连 续 跌 停 大 崩 盘，
没有什么，谁也没想到啊，友邦惊诧，黑 天 鹅 白天鹅 哥斯拉，
一切都是，蓄 谋 已 久 的精心策划。zéi 喊捉zéi。


{一} 今时今曰{癸卯2023年10月01曰 } ：
今时今曰，我预.测，人类有始.以来最大的金.融.崩 盘 ，未来三个月
之内，即，2023年11月、12月、2024年元月，将 震 撼呈 现。
---- 中卝囯股市、全球股市、全球金融市场 连序跌婷大崩 盘 ， 大盘连
       续或稍稍间断30/40多个跌亭板，人类有.史以来最大的金融.嗨啸。
股市、汇市、债市、期货商品、可能还有楼卝市，全部连卝锁式彻底崩溃。
黄 金 价 格 应 该 避 险 bào 涨。
忽 然 之 间 ，天 塌 了。{ 全 球 闪 崩 }
十 八 级 金融大 地.震，史无前例地球崩卝盘，要 多 惨 有 多惨，世界沫曰。
金融天坑，股市雪崩、铡 dāo 斩 首 、bào 雷 溃 坝 ，希 特 勒 巴巴罗萨
金融闪击战 。画 皮 ，终 于 撕 去 了 。
最热的天气，最冷的人心。
道琼斯，憋了14年的一泡shǐ{⑥440.О8}，2023冬季，总算找到了，公共厕所。
缠中说禅17年之前预卝言的，2019毁miè性下跌。{有四年误差}
已故“周期天王”周金涛的，“2018年到2019年

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