Web前端新人笔记之CSS值和单位_html/css_WEB-ITnose
数字
颜色——命名颜色
在Css2.1中规范定义了17个颜色名。包括html4.0中定义的16个颜色及外加一个橙色；
<h1 id="aqua">aqua</h1><h1 id="fuchsia">fuchsia</h1><h1 id="lime">lime</h1><h1 id="olive">olive</h1><h1 id="red">red</h1><h1 id="white">white</h1><h1 id="black">black</h1><h1 id="gray">gray</h1><h1 id="maroon">maroon</h1><h1 id="orange">orange</h1><h1 id="silver">silver</h1><h1 id="yellow">yellow</h1><h1 id="blue">blue</h1><h1 id="green">green</h1><h1 id="navy">navy</h1><h1 id="pruple">pruple</h1><h1 id="teal">teal</h1>
当然网页上不只有这些颜色组成。Web浏览器能识别多达140多个颜色名。包括上面我们提到的。具体就不介绍了；
颜色——RGB颜色
计算机通过组合不同的红色、绿色、蓝色创建新的颜色，这种组合成为RGB颜色；
使用百分数记法指定白色和黑色： rgb(100%,100%,100%); rgb(0%,0%,0%);使用整数三元组记法： rgb(255,255,255); rgb(0,0,0);
如果当用户输入的值为小数且值是在可取范围之内的。都会以"四舍五入"的方式精确到最接近范围的边界。如果一个值大于100%或者小于0%。都会被默认的调整回到100%或者0%；
p spanOne{color:rgb(300%,1230%,110%);}/*100%,100%,100%*/p spanTwo{color:rgb(0%,-780%,-34535%);}/*0%,0%,0%*/p spanThree{color:rgb(13,35,656);}/*13,35,255*/颜色——16进制RGB颜色
工作原理：将三个介于00~FF的16进制数连起来。就能设置一种颜色。记法的一般语法是#AABBCC。且三个数之间没有空格、逗号及其他分隔符。
h1{color:rgb(255,255,255) ;} 等价于 h1{color:#FFFFFF ;}而h1{colol:reb(51,102,58);} 等价于 h1{color:#336680}颜色——等忦颜色表
颜色——Web安全色
0%或者0是一个安全值。如果使用RGB百分数，要让所有的3个值都要么是0%或者是一个能被20整除的数eg: rgb(40%,100%,80%);如果使用0~255范围的RGB值那么所有的3个值都要么是0或者是一个能被51整除的数eg: rgb(0,204,153);
长度单位
英寸(in)、厘米(cm) 、毫米(mm)、点(pt)、派卡(pica)；
长度单位——相对长度单位
相对长度单位共有3种：em、ex和px
ps:<br />本章内容只是自己根据阅读CSS权威指南做出的一点小知识积累。可能不太详细，如若有大神阅读本文章尽量对我的文章做出点评。让我知道还有哪些不足之处加以改正
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