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今天小編給大家分享一下css3選擇器,邊框,圓角,背景和漸變的方法的相關知識點，內容詳細，邏輯清晰，相信大部分人都還太了解這方面的知識，所以分享這篇文章給大家參考一下，希望大家閱讀完這篇文章后有所收獲，下面我們一起來了解一下吧。
Css3選擇器相關：
section > div直接子元素選擇器
div + article相鄰兄弟選擇器（在元素之后出現）
div ~ article通用兄弟選擇器（在元素之后出現）
屬性選擇器：
a[href] {
text-decoration: none;
}
a[href="#"] {
color: #f00;
}
/*包含two且屬性值用空格分隔：*/
a[class~="two"] {
color: #ff0;
}
/*屬性的第一個值以#開頭：*/
a[href^="#"] {
color: #0f0;
}
/*以#結尾：*/
a[href$="#"] {
color: #00f;
}
/*包含#：*/
a[href*="#"] {
color: #0ff;
}
/*第一個屬性值以#-開頭：*/
a[href|="#"] {
color: #f0f;
}UI元素偽類：
Input:disabled
Input:enabled
Input:checked
div:first-child匹配屬于其父元素的第1個子元素且是div，計數時不分類型，顯示時分類型
div:last-child匹配屬于其父元素的最后1個子元素且是div，計數時不分類型，顯示時分類型div:nth-child(2) 匹配屬于其父元素的第n個子元素且是div，計數時不分類型，顯示時分類型div:nth-lat-child(2) 匹配屬于其父元素的第n個子元素且是div，計數時不分類型，顯示時分類型
n匹配下標，從0開始計算：
li:nth-child(2n) 雙數
li:nth-child(2n+1) 單數
li:nth-child(n+4)
li:nth-child(odd) 奇數，下標從1開始計算
li:nth-child(even) 偶數，下標從1開始計算
li:nth-last-child(3) 倒數第3個
article:only-child 屬于父元素的唯一元素，且是article(沒有任何其他子元素)
div:nth-of-type(2) 匹配屬于其父元素的第2個子元素且是div，計數時分類型
div:nth-last-of-type(2)
div:first-of-type div:last-of-type
article:only-of-type 屬于父元素的唯一article元素（可以有其他類型的子元素）
div:empty 沒有子元素的div元素（包括文本也沒有）
a:not(:last-of-type) 不是最后一個a子元素
id選擇器權重大于屬性選擇器
.red > [class=”red”]
Css偽元素：
div::selection 文本被選中后的樣式
::-moz-selection 火狐
Css3邊框與圓角：
四個值按照順時針方向來
Border-radius兼容性寫法：
-webkit-border-radius: 50%; -moz-border-radius: 50%; -ms-border-radius: 50%; -o-border-radius: 50%; border-radius: 50%;
box-shadow水平偏移 垂直偏移 模糊 擴展 顏色 內部
box-shadow: 50px 30px 0px 0px yellow inset;
border-image-repeat:stretch（拉伸）/repeat（重復）/round（鋪滿）/initial/inherit
border-image-source: url("border.jpg");
border-image-slice: 50%;/*圖像邊界向內偏移*/
border-image-width: 50%;/*圖像邊界的寬度*/
border-image-outset: 2; /*在邊框外部繪制*/
border-image-repeat: repeat;css3背景與漸變：
背景繪制區域（顯示范圍）
background-clip: border-box; background-clip: padding-box; background-clip: content-box;
背景圖像定位（起始位置，原點位置，與偏移搭配使用）
background-origin: border-box; background-origin: padding-box; background-origin: content-box; background-position:10px 10px; /*與偏移搭配使用*/
background-size只寫一個值，第二個默認是auto，根據比例等比縮放
background-size: contain; /*等比縮放到某一邊達到容器邊緣*/ background-size: cover;/*等比縮放填滿容器*/ background-size: 800px 500px; background-size: 800px; background-size: 50% 50%; background-size: 50%; background-size: 100% 100%; background-size: 100%;
background-image多重背景，前面的會覆蓋后面的
background-image: url('bg2.png'), url('bg1.jpg');demo：
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>background-image</title>
<style type="text/css">
div{
width:300px;
height:300px;
background:url(1.jpg) no-repeat center top,
url(2.jpg) no-repeat center 100px,
url(3.jpg) no-repeat center 200px;
margin:0 auto;
}
</style>
</head>
<body>
<div></div>
</body>
</html>
默認從上到下漸變：
div {
width: 800px; height: 500px;
background: -webkit-linear-gradient(red, blue);
background: -moz-linear-gradient(red, blue);
background: -o-linear-gradient(red, blue);
background: linear-gradient(red, blue);
}從左到右漸變
div {
width: 800px; height: 500px;
background: -webkit-linear-gradient(left, red , blue);
background: -moz-linear-gradient(right, red, blue);
background: -o-linear-gradient(right, red, blue);
background: linear-gradient(to right, red , blue);
}左上角開始的對角線漸變
div {
width: 800px; height: 500px;
background: -webkit-linear-gradient( left top, red, yellow, blue);
background: -moz-linear-gradient( right bottom, red, yellow, blue);
background: -o-linear-gradient( right bottom, red, yellow, blue);
background: linear-gradient(to right bottom, red, yellow, blue);
}角度控制方向
角度漸變是水平線和漸變線之間的角度，0deg是從下到上，90度是從左到右
div {
width: 800px; height: 500px;
background: -webkit-linear-gradient(135deg, red, yellow, blue);
background: -moz-linear-gradient(135deg, red, yellow, blue);
background: -o-linear-gradient(135deg, red, yellow, blue);
background: linear-gradient(135deg, red, yellow, blue);
}漸變具體位置控制
div {
width: 800px; height: 500px;
background: -webkit-linear-gradient(90deg, red 10%, orange 15%, yellow 20%, green 50%, blue 70%, indigo 80%, violet 100%);
background: -moz-linear-gradient(90deg, red 10%, orange 15%, yellow 20%, green 50%, blue 70%, indigo 80%, violet 100%);
background: -o-linear-gradient(90deg, red 10%, orange 15%, yellow 20%, green 50%, blue 70%, indigo 80%, violet 100%);
background: linear-gradient(90deg, red 10%, orange 15%, yellow 20%, green 50%, blue 70%, indigo 80%, violet 100%);
}透明色漸變
div {
width: 800px; height: 500px;
background: -webkit-linear-gradient(90deg, rgba(255, 0, 0, 0), rgba(255, 0, 0, 1));
background: -moz-linear-gradient(90deg, rgba(255, 0, 0, 0), rgba(255, 0, 0, 1));
background: -o-linear-gradient(90deg, rgba(255, 0, 0, 0), rgba(255, 0, 0, 1));
background: linear-gradient(90deg, rgba(255, 0, 0, 0), rgba(255, 0, 0, 1));
}重復漸變
div {
width: 800px; height: 500px;
background: -webkit-repeating-linear-gradient(90deg, red 0%, blue 10%, red 20%);
background: -moz-repeating-linear-gradient(90deg, red 0%, blue 10%, red 20%);
background: -o-repeating-linear-gradient(90deg, red 0%, blue 10%, red 20%);
background: repeating-linear-gradient(90deg, red 0%, blue 10%, red 20%);
}徑向漸變，從內到外
div {
width: 800px; height: 500px;
background: -webkit-radial-gradient(red, blue);
background: -moz-radial-gradient(red, blue);
background: -o-radial-gradient(red, blue);
background: radial-gradient(red, blue);
}圓形漸變
div {
width: 800px; height: 500px;
background: -webkit-radial-gradient(circle, red, blue);
background: -moz-radial-gradient(circle, red, blue);
background: -o-radial-gradient(circle, red, blue);
background: radial-gradient(circle, red, blue);
}橢圓形漸變
div {
width: 800px; height: 500px;
background: -webkit-radial-gradient(ellipse, red, blue);
background: -moz-radial-gradient(ellipse, red, blue);
background: -o-radial-gradient(ellipse, red, blue);
background: radial-gradient(ellipse, red, blue);
}漸變從圓心到最近邊
div.closest-side {
width: 300px; height: 200px; margin: 50px;
background: -webkit-radial-gradient(30% 70%, circle closest-side, red, blue);
background: -moz-radial-gradient(30% 70%, circle closest-side, red, blue);
background: -o-radial-gradient(30% 70%, circle closest-side, red, blue);
background: radial-gradient(30% 70%, circle closest-side, red, blue);
}漸變從圓心到最遠邊
div.farthest-side {
width: 300px; height: 200px; margin: 50px;
background: -webkit-radial-gradient(30% 70%, farthest-side, red, blue);
background: -moz-radial-gradient(30% 70%, farthest-side, red, blue);
background: -o-radial-gradient(30% 70%, farthest-side, red, blue);
background: radial-gradient(30% 70%, farthest-side, red, blue);
}漸變從圓心到最近角
div.closest-corner {
width: 300px; height: 200px; margin: 50px;
background: -webkit-radial-gradient(30% 70%, closest-corner, red, blue);
background: -moz-radial-gradient(30% 70%, closest-corner, red, blue);
background: -o-radial-gradient(30% 70%, closest-corner, red, blue);
background: radial-gradient(30% 70%, closest-corner, red, blue);
}漸變從圓心到最遠角
div.farthest-corner {
width: 300px; height: 200px; margin: 50px;
background: -webkit-radial-gradient(30% 70%, farthest-corner, red, blue);
background: -moz-radial-gradient(30% 70%, farthest-corner, red, blue);
background: -o-radial-gradient(30% 70%, farthest-corner, red, blue);
background: radial-gradient(30% 70%, farthest-corner, red, blue);
}IE漸變從上到下
div {
width: 800px;
height: 500px;
filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#ff0000', endColorstr='#0000ff',GradientType=0 );
}IE漸變從左到右
div {
width: 800px;
height: 500px;
filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#ff0000', endColorstr='#0000ff',GradientType=1 );
}Demo：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>線性漸變 - 特殊案例</title>
<style type="text/css">
div {
width: 800px; height: 500px; background: #abcdef; background-size: 50px 50px;
background-image:
-webkit-gradient(linear, 0 0, 100% 100%, color-stop(.25, #555), color-stop(.25, transparent), to(transparent)),
-webkit-gradient(linear, 0 100%, 100% 0, color-stop(.25, #555), color-stop(.25, transparent), to(transparent)),
-webkit-gradient(linear, 0 0, 100% 100%, color-stop(.75, transparent), color-stop(.75, #555)),
-webkit-gradient(linear, 0 100%, 100% 0, color-stop(.75, transparent), color-stop(.75, #555));
background-image:
-moz-linear-gradient(45deg, #555 25%, transparent 25%, transparent),
-moz-linear-gradient(-45deg, #555 25%, transparent 25%, transparent),
-moz-linear-gradient(45deg, transparent 75%, #555 75%),
-moz-linear-gradient(-45deg, transparent 75%, #555 75%);
background-image:
-o-linear-gradient(45deg, #555 25%, transparent 25%, transparent),
-o-linear-gradient(-45deg, #555 25%, transparent 25%, transparent),
-o-linear-gradient(45deg, transparent 75%, #555 75%),
-o-linear-gradient(-45deg, transparent 75%, #555 75%);
background-image:
linear-gradient(45deg, #555 25%, transparent 25%, transparent),
linear-gradient(-45deg, #555 25%, transparent 25%, transparent),
linear-gradient(45deg, transparent 75%, #555 75%),
linear-gradient(-45deg, transparent 75%, #555 75%);
}
</style>
</head>
<body>
<div></div>
</body>
</html>以上就是“css3選擇器,邊框,圓角,背景和漸變的方法”這篇文章的所有內容，感謝各位的閱讀！相信大家閱讀完這篇文章都有很大的收獲，小編每天都會為大家更新不同的知識，如果還想學習更多的知識，請關注億速云行業資訊頻道。
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