效果原理

主要利用css渐变实现一些不需要切图的背景镂空

优惠券样式

.mixinsTicket(@width, @height, @r, @left, @lcolor, @rcolor) {    width: @width;    height: @height;    background:              radial-gradient(circle at top right, transparent @r, @lcolor 0) -(@width - @left) top ~/ 100% 51% no-repeat,              radial-gradient(circle at bottom right, transparent @r, @lcolor 0) -(@width - @left) bottom ~/ 100% 51% no-repeat,              radial-gradient(circle at top left, transparent @r, @rcolor 0) @left 0 ~/ 100% 51% no-repeat,              radial-gradient(circle at bottom left, transparent @r, @rcolor 0) @left bottom ~/ 100% 51%  no-repeat;}
.mixinsTicket1(@width, @height, @r, @top, @color) {   width: @width;   height: @height;   background:               radial-gradient(circle at bottom left, transparent @r, @color 0) left (@top - @height) ~/ 51% 100% no-repeat,               radial-gradient(circle at top left, transparent @r, @color 0) left @top ~/ 51% 100% no-repeat,               radial-gradient(circle at bottom right, transparent @r, @color 0) right (@top - @height) ~/ 51% 100% no-repeat,               radial-gradient(circle at top right, transparent @r, @color 0) right @top ~/ 51% 100%  no-repeat;   &::after{     content: ;     display: block;     position: absolute;     width: calc(100% - 2 * @r);     left: @r;     top: @top;     border-top: 1px dashed #fff;     transform: translateY(.5);   }}

切角效果

ps: 锯齿跟设备的显示有关系

.mixinFlag(@width, @height, @bg) when(default()) {    width: @width;    height: @height;    background:              linear-gradient(45deg, transparent sqrt(pow(@width/2, 2)/2), @bg 0) right,              linear-gradient(-45deg, transparent sqrt(pow(@width/2, 2)/2),  @bg 0) left;    background-size: 50% 100%;    background-repeat: no-repeat; } .mixinFlag(@width, @height, @bg) when(@width > @height) {    width: @width;    height: @height;    background:              linear-gradient(-45deg, transparent sqrt(pow(@height/2, 2)/2), @bg 0) top left,              linear-gradient(-135deg, transparent sqrt(pow(@height/2, 2)/2), @bg 0) bottom left;    background-size: 100% 50%;    background-repeat: no-repeat;}
.mixinsMark(@width, @height, @bg) {    width: @width;    height: @height;    background:              linear-gradient(-45deg, transparent sqrt(pow(@height/2, 2)/2), @bg 0) bottom left,              linear-gradient(-135deg, transparent sqrt(pow(@height/2, 2)/2), @bg 0) top left;    background-size: 100% 50%;    background-repeat: no-repeat;}

ps:以上效果四个方向都可以实现,其他方向代码没有贴出,原理相同

格子布

css {    width: 510px;    height: 128px;    background: #FFF;    background-image: linear-gradient(rgba(182, 128, 102, .8) 8px, transparent 0),                      linear-gradient(90deg, rgba(182, 128, 102, .8) 8px, transparent 0);    background-size: 8px 14px, 14px 8px;}

焦点

.mask {  position: fixed;  top: 0;  left: 0;  z-index: 100;  width: 100vw;  height: 100vh;  background:  radial-gradient(closest-side at 50% 278rpx, transparent 140rpx, rgba(0, 0, 0, .12) 180rpx, rgba(0, 0, 0, .22) 200rpx, rgba(0,0,0,.3) 220rpx, rgba(0,0,0, .4)) no-repeat;}

总结

每一层渐变都可被当做一张背景图,也就是说每一层渐变都可以指定其position、size、repeat。玩过PS的的同学应该知道图层的概念,咱们的背景图层叠原理也类似(当然,渐变也可以当背景图),控制渐变的大小,哪里需要镂空,以及需要显示的位置、是否平铺,就可以实现大多数场景下的基本效果,当然,一张切图来的更快,但是有时候切图并不能适应所有的场景。

掌握background的书写顺序可以帮助在脑海中构思自己想要的效果:


复制代码代码如下:background: bg-color || bg-image || bg-position [ / bg-size]? || bg-repeat || bg-attachment || bg-origin || bg-clip

以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持脚本之家。

CSS实现镂空效果的示例代码