同事帮我用css作出炫酷的卡券效果，深感崇拜啊

前言

前几天，我接到了一个项目，模块中要写一个卡券效果，当时没有图片，也就是要用css来实现，当时我是懵逼的，也没有写过这样的，一时间不知道怎么写，毕竟要写的像UI设计的同样美观。我就只好求救个人大神级别的同事了。不只css玩的溜，人家JavaScript玩的更溜，阁下实在是佩服。

常见的卡券样式以下：

 

同事二话没说，直接给我写了一种，那真的是快如闪电就给我实现了一个。是用伪元素实现的

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 是为了不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;

 

 

后面我回去以后，仔细去研究了一下，想把它作得更好看，而后就有了升级版样式一

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 是为了不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状况
   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 是为了不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状况
   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 是为了不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状况
   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;
 }

 

后面也接连改了几回，你们看一看效果怎么样

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 是为了不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状况
   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以下：
 //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 ，能够理解为从这里开始从新设置样式区间*/
 /*background: radial-gradient(circle at top right, transparent 50px, red 0, #66a8ff 50%);*/
 ​
 /*在Chrome下，若是两个区域之间颜色直接以 0 误差过渡，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);*/

 

后面我对照这几个，最后我选了最后一种样式，我以为这个比较酷，最后拿过去给他们看，他们也以为这个方案很是好看，获得了别人的承认，我也以为很开心。

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