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);*/
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