前端颜色表:https://blog.csdn.net/zhengguoliangyls/article/details/80502166
选择器:
id选择器:#id
类选择器:.class
标签选择器:p、div、h1、、、、
后代选择器:空格隔开,后面的元素是前面的子元素:#box li .a1
并集选择器:用逗号隔开:p,#box,.a
交集选择器:前面的标签是后面的元素的父元素:ul#a
子元素选择器:h2>em
属性选择器:[font]或[type="text"]或[href][alt]或a[href]
伪元素选择器 如:E:first-line,E:before,E:after
伪类选择器 如:E:first-child ,E:visited,E:focus,E:enabled
高级选择器:
:first-of-type
:last-of-type
:first-child
:last-child
:only-child
:only-of-type
:nth-child(n) 只按顺序选取元素
:nth-of-type(n) 指定元素在父元素中的第几个 比如要获取父元素中的第一个span元素: 父元素 span:nth-of-type(1)
盒模型
width、border-lleft、border-right、padding-left、padding-right、margin-left、margin-right
height、border-top、border-bottom、padding-top、padding-bottom、margin-top、margin-bottom
正常和模型:box-sizing:content-box;
怪异盒模型:box-sizing:border-box;
display属性
none、inline、inline-block、block
清除浮动:(防止父元素塌陷)
1、给父元素加固定高度或者加overflow:hidden;
2、clear:left、right、both
3、在所有浮动元素后加一个空div,加上clear:both;
4、伪元素清除浮动:
.clearfix:after {
content: ".";
visibility: hidden;
display: block;
height: 0;
clear: both;
}
visibility:hidden:元素隐藏,但是还保存元素所占据的空间,display:none;不占据空间
定位
position:fixed、relative、absolute;
z-index:整数;为元素定义层数
!Important(将权重变为最大)
#content{
height:960px !important;
height:900px;
}
@import导入样式 这种方式导入样式,先加载html,再加载css link与其相反
@import url("global.css");
@import url(global.css);
@import "global.css";
圆角
border-radius:像素/百分比;
集合写法
#box{border-radius:10px 20px 30px 40px;}
左上、右上、右下、左下
#box{border-radius:10px 20px 30px;}
左上、右上和左下、右下
#box{border-radius:10px 20px;}
左上和右下、右上和左下
#box{border-radius:10px;}
四个角
css3背景
background:background-color ||background-image || background-repeat || background-attachment || background-position||background-size
background-image:url("图片的网址"); 背景图
background: url(" 图片的网址 "); 背景
background-color:#色码; 背景色彩
background-position:默认值:0% 0%,可能值:top left ,center left等
background-repeat:默认值:repeat
scroll 拉动卷轴时,背景图片会跟着移动(缺省值)
fixed 拉动卷轴时,背景图片不会跟着移动
repeat 背景图片并排
background-size:是css3规定的属性,50%为缩放图片;100px 50px:把图片调整到100像素宽,50像素高;cover:拉大图片,使其完全填满背景区;container:缩放图片,使其恰好适合背景区
background-position:
X坐标 Y坐标
css3旋转
div{
transform:rotate(7deg);
-ms-transform:rotate(7deg); /* IE 9 */
-moz-transform:rotate(7deg); /* Firefox */
-webkit-transform:rotate(7deg); /* Safari 和 Chrome */
-o-transform:rotate(7deg); /* Opera */
}
css盒子阴影
box-shadow:h-shadow v-shadow blur spread color inset/outset;
v-shadow:必须,垂直阴影位置,允许负值(px)
h-shadow:必须,水平阴影位置,允许负值(px)
blur:可选,模糊度(px)
color:可选
inset/outset:可选,阴影内置还是外置,默认是outset
div{
box-shadow: 10px 10px 5px #888888;
}
box-shadow: 0px 0px 0px 0px yellow inset,/*上*/ 0px 0px 0px 0px red inset,/*左*/ 0px 0px 0px 0px green inset,/*右*/ 0px -2px 10px 0px #afafaf inset;/*下*/
css3文字阴影
text-shadow
div{text-shadow:5px 2px 6px #000;}
换行
test {word-wrap:break-word;}
css透明
1、background:rgba(0,0,0,0.5) >=ie8
2、opacity:0.8; 取值为[0-1]
3、filer:alpha(opacity=80); 取值为[0-100] <ie8
4、transparent 用到任何一个带color值的属性上 background-color:transparent;
css3位移
transform:translate(10px 20px);向右位移10px 向下位移20px
transform:translate(10px);向x轴方向位移10px
transform:translateX()
transform:translateY()
transform:translateZ()
transform:translate(x y)
transform:translate(x y z)
规定从电脑屏幕到你的脸的方向为Z轴正方形
css3缩放
transform:scale(0.5)整体缩小一半
transform:scale(x,y) 水平缩放x 垂直缩放 y
css3 3D效果
先声明时3D效果
/*声明3d效果*/
transform-style:preserve-3d;
-ms-transform-style:preserve-3d;
-moz-transform-style:preserve-3d;
-webkit-transform-style:preserve-3d;
-o-transform-style:preserve-3d;
/*透视度*/
perspective:20000px;
-ms-perspective:500px;
-moz-perspective:500px;
-webkit-perspective:500px;
-o-perspective:500px;
transform:rotateY(-45deg) rotateX(0deg) rotateZ(0deg);
transform:translate(x,y,z)
transform:rotate(x,y,z)
transform:scale(x,y,z)
css3过渡
div
{
transition-property: width;
transition-duration: 1s;
transition-timing-function: linear;
transition-delay: 2s;
/* Firefox 4 */
-moz-transition-property:width;
-moz-transition-duration:1s;
-moz-transition-timing-function:linear;
-moz-transition-delay:2s;
/* Safari 和 Chrome */
-webkit-transition-property:width;
-webkit-transition-duration:1s;
-webkit-transition-timing-function:linear;
-webkit-transition-delay:2s;
/* Opera */
-o-transition-property:width;
-o-transition-duration:1s;
-o-transition-timing-function:linear;
-o-transition-delay:2s;
}
和写
div
{
transition: width 1s linear 2s;
/* Firefox 4 */
-moz-transition:width 1s linear 2s;
/* Safari and Chrome */
-webkit-transition:width 1s linear 2s;
/* Opera */
-o-transition:width 1s linear 2s;
}
transition:属性名/all 、 过渡持续时间 、过渡曲线、延迟开始时间;(时间单位为s)
时间曲线值:linear、ease、ease-in、ease-out、ease-in-out
css3线性渐变(背景)
从左到右
#grad {
background: -webkit-linear-gradient(left, red , blue); /* Safari 5.1 - 6.0 */
background: -o-linear-gradient(right, red, blue); /* Opera 11.1 - 12.0 */
background: -moz-linear-gradient(right, red, blue); /* Firefox 3.6 - 15 */
background: linear-gradient(to right, red , blue); /* 标准的语法 */
}
从左上角到右下角的线性渐变:
#grad {
background: -webkit-linear-gradient(left top, red , blue); /* Safari 5.1 - 6.0 */
background: -o-linear-gradient(bottom right, red, blue); /* Opera 11.1 - 12.0 */
background: -moz-linear-gradient(bottom right, red, blue); /* Firefox 3.6 - 15 */
background: linear-gradient(to bottom right, red , blue); /* 标准的语法 */
}
带有指定的角度的线性渐变: 规定上方为0deg 顺时针
从上到下
#grad {
background: -webkit-linear-gradient(180deg, red, blue); /* Safari 5.1 - 6.0 */
background: -o-linear-gradient(180deg, red, blue); /* Opera 11.1 - 12.0 */
background: -moz-linear-gradient(180deg, red, blue); /* Firefox 3.6 - 15 */
background: linear-gradient(180deg, red, blue); /* 标准的语法 */
}
下面的实例演示了如何创建一个带有彩虹颜色和文本的线性渐变:
#grad1 {
height: 55px;
background: -webkit-linear-gradient(left, red, orange, yellow, green, blue, indigo, violet); /* Safari 5.1 - 6.0 */
background: -o-linear-gradient(left, red, orange, yellow, green, blue, indigo, violet); /* Opera 11.1 - 12.0 */
background: -moz-linear-gradient(left, red, orange, yellow, green, blue, indigo, violet); /* Firefox 3.6 - 15 */
background: linear-gradient(to right, red, orange, yellow, green, blue, indigo, violet); /* 标准的语法(必须放在最后) */
}
一个重复的线性渐变:
#grad {
/* Safari 5.1 - 6.0 */
background: -webkit-repeating-linear-gradient(red, yellow 10%, green 20%);
/* Opera 11.1 - 12.0 */
background: -o-repeating-linear-gradient(red, yellow 10%, green 20%);
/* Firefox 3.6 - 15 */
background: -moz-repeating-linear-gradient(red, yellow 10%, green 20%);
/* 标准的语法 */
background: repeating-linear-gradient(red, yellow 10%, green 20%);
}
css3径向渐变
颜色结点均匀分布的径向渐变:
#grad {
background: -webkit-radial-gradient(red, green, blue); /* Safari 5.1 - 6.0 */
background: -o-radial-gradient(red, green, blue); /* Opera 11.6 - 12.0 */
background: -moz-radial-gradient(red, green, blue); /* Firefox 3.6 - 15 */
background: radial-gradient(red, green, blue); /* 标准的语法 */
}
径向渐变 - 颜色结点不均匀分布
#grad {
background: -webkit-radial-gradient(red 5%, green 15%, blue 60%); /* Safari 5.1 - 6.0 */
background: -o-radial-gradient(red 5%, green 15%, blue 60%); /* Opera 11.6 - 12.0 */
background: -moz-radial-gradient(red 5%, green 15%, blue 60%); /* Firefox 3.6 - 15 */
background: radial-gradient(red 5%, green 15%, blue 60%); /* 标准的语法 */
}
shape 参数定义了形状。它可以是值 circle 或 ellipse。其中,circle 表示圆形,ellipse 表示椭圆形。默认值是 ellipse。
#grad {
background: -webkit-radial-gradient(circle, red, yellow, green); /* Safari 5.1 - 6.0 */
background: -o-radial-gradient(circle, red, yellow, green); /* Opera 11.6 - 12.0 */
background: -moz-radial-gradient(circle, red, yellow, green); /* Firefox 3.6 - 15 */
background: radial-gradient(circle, red, yellow, green); /* 标准的语法 */
}
css3元素定位原点
transform-origin:x y;
transform-origin:100%;一个值代表在x轴的右边,相当于right
transform-origin:0% 100%;原点在左下角
transform-origin:top 100%;原点在右上角
transform-origin:0% bottom;原点在左下角
transform-origin:top right;原点在右上角
transform-origin:center center;原点在中心
transform-origin:50% 50%;原点在中心
transform-origin:50px 50px;原点在(50px,50px)处
css3动画
声明动画帧
@keyframes myfirst
{
from {background: red;}
to {background: yellow;}
}
@-webkit-keyframes myfirst /* Safari 与 Chrome */
{
from {background: red;}
to {background: yellow;}
}
@keyframes myfirst
{
0% {background: red;}
25% {background: yellow;}
50% {background: blue;}
100% {background: green;}
}
@-webkit-keyframes myfirst /* Safari 与 Chrome */
{
0% {background: red;}
25% {background: yellow;}
50% {background: blue;}
100% {background: green;}
}
@keyframes myfirst
{
0% {background: red; left:0px; top:0px;}
25% {background: yellow; left:200px; top:0px;}
50% {background: blue; left:200px; top:200px;}
75% {background: green; left:0px; top:200px;}
100% {background: red; left:0px; top:0px;}
}
@-webkit-keyframes myfirst /* Safari 与 Chrome */
{
0% {background: red; left:0px; top:0px;}
25% {background: yellow; left:200px; top:0px;}
50% {background: blue; left:200px; top:200px;}
75% {background: green; left:0px; top:200px;}
100% {background: red; left:0px; top:0px;}
}
将动画帧绑定到元素上
div
{
animation-name: myfirst;
animation-duration: 5s;
animation-timing-function: linear;
animation-delay: 2s;
animation-iteration-count: infinite;
animation-direction: alternate;
animation-play-state: running;
/* Safari 与 Chrome: */
-webkit-animation-name: myfirst;
-webkit-animation-duration: 5s;
-webkit-animation-timing-function: linear;
-webkit-animation-delay: 2s;
-webkit-animation-iteration-count: infinite;
-webkit-animation-direction: alternate;
-webkit-animation-play-state: running;
}
和写
div
{
animation: myfirst 5s linear 2s infinite alternate;
/* Safari 与 Chrome: */
-webkit-animation: myfirst 5s linear 2s infinite alternate;
}
动画帧、动画持续时间、播放曲线、延迟时间、播放次数、是否反向播放