CSS 中使用径向渐变实现卡券效果
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前几天，同事接到一个积分商城项目，其中有一个卡券兑换礼品功能。我想了一会没什么好的思路，就忙自己的项目去了。但想到以后自己可能也会遇到类似的需求，所以周末学习整理了下几种卡券效果的实现。
常见的卡券样式如下：
使用伪元素实现（Less 版本）
ticket.less
.ordinary-mixins-ticket-horizontal(@width,@height,@r,@top, @color) {
position: relative;
box-sizing: border-box;
padding: 0 @r;
width: @width;
height: @height;
background-clip: content-box;
background-color: @color;
&::before {
position: absolute;
top: 0;
left: 0;
content: "";
display: block;
width: @r + 1px;
height: 100%;
background: radial-gradient(@r circle at left @top, transparent @r, @color @r + 1px);
}
&::after {
position: absolute;
top: 0;
right: 0;
content: "";
display: block;
//这里的 @r + 1px 是为了避免某些百分百比缩放页面时，出现空隙
width: @r + 1px;
height: 100%;
//这里的 @r + 1px 是为了防止出现锯齿
background: radial-gradient(@r circle at right @top, transparent @r, @color @r + 1px);
}
}
.parent {
.ordinary-mixins-ticket-horizontal(200px, 200px, 10px, 150px, #fc3a28);
}
.child {
line-height: 200px;
}
App.js
import React from 'react';
import './App.css';
import './ticket.less';
function App() {
return (
<div className="App" style={
{
display: "flex",
justifyContent: "center",
alignItems: "center",
height: 600
}
}>
<div className={'parent'}>
<div className="child">666</div>
</div>
</div>
);
}
export default App;
升级版样式一（Less 版本）
.mixins-ticket-vertical(@width, @height, @r, @left, @l-color, @r-color) {
width: @width;
height: @height;
// @left - 1px 是为了避免某些百分百比缩放页面时，出现空隙
// @r + 1px 是为了防止出现锯齿
// 51% 是为了防止出现元素中间会有一小段空白区域的情况
background: radial-gradient(circle at left top, transparent @r, @l-color @r + 1px) @left - 1px top ~'/' 100% 51% no-repeat,
radial-gradient(circle at left bottom, transparent @r, @l-color @r + 1px) @left - 1px bottom ~'/' 100% 51% no-repeat,
radial-gradient(circle at right top, transparent @r, @r-color @r + 1px ) -(@width - @left) top ~'/' 100% 51% no-repeat,
radial-gradient(circle at right bottom , transparent @r, @r-color @r + 1px ) -(@width - @left) bottom ~'/' 100% 51% no-repeat;
filter: drop-shadow(2px 2px 2px rgba(0, 0, 0, .2));
}
.mixins-ticket-vertical-two(@width, @height, @r, @left, @l-color, @r-color) {
width: @width;
height: @height;
// @left + 1px 是为了避免某些百分百比缩放页面时，出现空隙
// @r + 1px 是为了防止出现锯齿
// 51% 是为了防止出现元素中间会有一小段空白区域的情况
background: radial-gradient(circle at left top, transparent @r, @r-color @r + 1px) right top ~'/' (@width - @left) 51% no-repeat,
radial-gradient(circle at left bottom, transparent @r, @l-color @r + 1px) right bottom ~'/' (@width - @left) 51% no-repeat,
radial-gradient(circle at right top, transparent @r, @r-color @r + 1px) left top ~'/' @left + 1px 51% no-repeat,
radial-gradient(circle at right bottom, transparent @r, @l-color @r + 1px) left bottom ~'/' @left + 1px 51% no-repeat;
filter: drop-shadow(2px 2px 2px rgba(0, 0, 0, .2));
}
.parent {
.mixins-ticket-vertical(200px, 200px, 10px, 150px, #fc3a28,#fc3a28);
//.mixins-ticket-vertical-two(200px, 200px, 10px, 150px, #fc3a28,#fc3a28);
}
.child {
line-height: 200px;
}
升级版样式一（Scss 版本）
@mixin mixins-ticket-vertical($width, $height, $r, $left, $l-color, $r-color) {
width: $width;
height: $height;
// $left - 1px 是为了避免某些百分百比缩放页面时，出现空隙
// $r + 1px 是为了防止出现锯齿
// 51% 是为了防止出现元素中间会有一小段空白区域的情况
background: radial-gradient(circle at left top, transparent $r, $l-color $r + 1px) $left - 1px top / 100% 51% no-repeat,
radial-gradient(circle at left bottom, transparent $r, $l-color $r + 1px) $left - 1px bottom / 100% 51% no-repeat,
radial-gradient(circle at right top, transparent $r, $r-color $r + 1px ) -($width - $left) top / 100% 51% no-repeat,
radial-gradient(circle at right bottom , transparent $r, $r-color $r + 1px ) -($width - $left) bottom / 100% 51% no-repeat;
filter: drop-shadow(2px 2px 2px rgba(0, 0, 0, .2));
}
.parent {
@include mixins-ticket-vertical(200px, 200px, 10px, 150px, #fc3a28, #fc3a28);
}
.child {
line-height: 200px;
}
升级版样式二（Less 版本）
.mixins-ticket-horizontal(@width, @height, @r, @top, @l-color, @r-color) {
width: @width;
height: @height;
background: radial-gradient(circle at left top, transparent @r, @l-color @r + 1px) left @top - 1px ~'/' 51% 100% no-repeat,
radial-gradient(circle at left bottom, transparent @r, @l-color @r + 1px) left -(@height - @top) ~'/' 51% 100% no-repeat,
radial-gradient(circle at right top, transparent @r, @r-color @r + 1px) right @top - 1px ~'/' 51% 100% no-repeat,
radial-gradient(circle at right bottom, transparent @r, @r-color @r + 1px) right -(@height - @top) ~'/' 51% 100% no-repeat;
filter: drop-shadow(2px 2px 2px rgba(0, 0, 0, .2));
}
.mixins-ticket-horizontal-two(@width, @height, @r, @top, @l-color, @r-color) {
width: @width;
height: @height;
background: radial-gradient(circle at left top, transparent @r, @r-color @r + 1px) left bottom ~'/' 51% (@height - @top) no-repeat,
radial-gradient(circle at left bottom, transparent @r, @l-color @r + 1px) left top ~'/' 51% @top + 1px no-repeat,
radial-gradient(circle at right top, transparent @r, @r-color @r + 1px) right bottom ~'/' 51% (@height - @top) no-repeat,
radial-gradient(circle at right bottom, transparent @r, @l-color @r + 1px) right top ~'/' 51% @top + 1px no-repeat;
filter: drop-shadow(2px 2px 2px rgba(0, 0, 0, .2));
}
.parent {
.mixins-ticket-horizontal(200px, 200px, 10px, 150px, #fc3a28,#fc3a28);
//.mixins-ticket-horizontal-two(200px, 200px, 10px, 150px, #fc3a28,#fc3a28);
}
.child {
line-height: 200px;
}
升级版样式三（Less 版本）
.mixins-ticket-horizontal-line(@width, @height, @r, @top, @l-color, @r-color,@border-offset,@border-color) {
width: @width;
height: @height;
background: radial-gradient(circle at left top, transparent @r, @l-color @r + 1px) left @top - 1px ~'/' 51% 100% no-repeat,
radial-gradient(circle at left bottom, transparent @r, @l-color @r + 1px) left -(@height - @top) ~'/' 51% 100% no-repeat,
radial-gradient(circle at right top, transparent @r, @r-color @r + 1px) right @top - 1px ~'/' 51% 100% no-repeat,
radial-gradient(circle at right bottom, transparent @r, @r-color @r + 1px) right -(@height - @top) ~'/' 51% 100% no-repeat;
filter: drop-shadow(2px 2px 2px rgba(0, 0, 0, .2));
&::after {
position: absolute;
left: 0;
right: 0;
top: @top;
margin: auto;
content: '';
width: calc(~"100%" - 2*@r - @border-offset);
border-top: 1px dashed @border-color;
}
}
.parent {
.mixins-ticket-horizontal(200px, 200px, 10px, 150px, #fc3a28,#fc3a28);
//.mixins-ticket-horizontal-two(200px, 200px, 10px, 150px, #fc3a28,#fc3a28);
}
.child {
line-height: 200px;
}
升级版样式四（Less 版本）
.mixins-ticket-vertical-three(@width, @height, @r, @left, @l-color, @r-color,@sm-r,@sm-offset,@sm-color) {
width: @width;
height: @height;
// @left - 1px 是为了避免某些百分百比缩放页面时，出现空隙
// @r + 1px 是为了防止出现锯齿
// 51% 是为了防止出现元素中间会有一小段空白区域的情况
background: radial-gradient(circle at left top, transparent @r, @l-color @r + 1px) @left - 1px top ~'/' 100% 51% no-repeat,
radial-gradient(circle at left bottom, transparent @r, @l-color @r + 1px) @left - 1px bottom ~'/' 100% 51% no-repeat,
radial-gradient(circle at right top, transparent @r, @r-color @r + 1px ) -(@width - @left) top ~'/' 100% 51% no-repeat,
radial-gradient(circle at right bottom , transparent @r, @r-color @r + 1px ) -(@width - @left) bottom ~'/' 100% 51% no-repeat;
filter: drop-shadow(2px 2px 2px rgba(0, 0, 0, .2));
&::after {
content: '';
position: absolute;
top: 0;
right: -@sm-r;
width: @sm-r;
height: 100%;
background-image: radial-gradient(circle at @sm-r, transparent @sm-r, @r-color @sm-r + 1px);
//background-size: @sm-r;
background-size: @sm-r @sm-offset;
}
}
.parent {
.mixins-ticket-vertical-three(200px, 200px, 10px, 150px, #fc3a28, #fc3a28,5px,20px,#fc3a28);
}
.child {
line-height: 200px;
}
注意事项
// ticket.less //background: radial-gradient(circle at top right, transparent @r, @lcolor 0) -(@width - @left) top ~'/' 100% 55% no-repeat; // 将上面的这行代码拆解如下： //background-image: radial-gradient(circle at top right, transparent @r, @lcolor 0); //background-position:-(@width - @left) top ; //background-size:100% 55% ; //background-repeat: no-repeat; /*注意：这里先是有 50px 的透明区域，紧接着第二个区域设置了 0 ，可以理解为从这里开始重新设置样式区间*/ /*background: radial-gradient(circle at top right, transparent 50px, red 0, #66a8ff 50%);*/ /*在Chrome下，如果两个区域之间颜色直接以 0 偏差过渡，会有比较严重的锯齿*/ /*background: radial-gradient(10px at left,transparent 50%,#F6327C 50%);*/ /*background: radial-gradient(10px at left,transparent 50%,#F6327C 55%);*/ /*加阴影效果*/ /*filter: drop-shadow(2px 2px 2px rgba(0,0,0,.2));*/ /*多个径向渐变累加*/ /*background: radial-gradient(50px 100px ellipse, transparent 40px, yellow 41px, red 49px, transparent 50px), radial-gradient(30px circle, red, red 29px, transparent 30px);*/
总结
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