.btn() { display: inline-block;//行内块元素 font-weight: @btn-font-weight;//字体粗细 text-align: center;//字体居中 touch-action: manipulation;//浏览器只允许进行滚动和持续缩放操作 cursor: pointer;//鼠标移上去形状 background-image: none;//背景图片为空 border: @border-width-base @border-style-base transparent;//边框透明 white-space: nowrap;//不换行 .button-size(@btn-height-base; @btn-padding-base; @font-size-base; @btn-border-radius-base);//padding height font-size border-radius设置 user-select: none;//文本不能被选择 transition: all .3s @ease-in-out;//过渡 position: relative;//相对定位 > .@{iconfont-css-prefix} { line-height: 1;//行高不带单位是相对字体的比例 } &, &:active, &:focus { outline: 0;//是绘制于元素周围的一条线，位于边框边缘的外围，可起到突出元素的作用 } &:not([disabled]):hover { text-decoration: none;//定义标准的文本 } &:not([disabled]):active { outline: 0; transition: none; } &.disabled, &[disabled] { cursor: not-allowed; > * { pointer-events: none;//元素永远不会成为鼠标事件的target } } &-lg { .button-size(@btn-height-lg; @btn-padding-lg; @btn-font-size-lg; @btn-border-radius-base); } &-sm { .button-size(@btn-height-sm; @btn-padding-sm; @btn-font-size-sm; @btn-border-radius-sm); }}

其中的具体属性不多说了，不知道的可以百度属性就知道了，大概就是设置字体粗细、字体居中、不换行、过渡、定位、边框、激活、焦点、hover、disabled等样式，其中btn中调用了button-size函数。&-lg、&-sm设置大按钮和小按钮，调用了button-size函数

.button-size(@height; @padding; @font-size; @border-radius) { padding: @padding; font-size: @font-size; border-radius: @border-radius; height: @height;}

以height、padding、font-size、border-radius为输入参数来设置按钮大小，宽度通过padding和font-size就能设置宽度。

下一个部分是设置按钮类型为主按钮、次按钮、虚线按钮、危险按钮、幽灵按键样式函数：

.button-variant-primary(@color; @background) { .button-color(@color; @background; @background); &:hover, &:focus { .button-color(@color; ~`colorPalette("@{background}", 5)`; ~`colorPalette("@{background}", 5)`); } &:active, &.active { .button-color(@color; ~`colorPalette("@{background}", 7)`; ~`colorPalette("@{background}", 7)`); } .button-disabled();}.button-variant-other(@color; @background; @border) { .button-color(@color; @background; @border); &:hover, &:focus { .button-color(@primary-5; @background; @primary-5); } &:active, &.active { .button-color(@primary-7; @background; @primary-7); } .button-disabled();}.button-variant-danger(@color; @background; @border) { .button-color(@color; @background; @border); &:hover { .button-color(@btn-primary-color; ~`colorPalette("@{color}", 5)`; ~`colorPalette("@{color}", 5)`); } &:focus { .button-color(~`colorPalette("@{color}", 5)`; #fff; ~`colorPalette("@{color}", 5)`); } &:active, &.active { .button-color(@btn-primary-color; ~`colorPalette("@{color}", 7)`; ~`colorPalette("@{color}", 7)`); } .button-disabled();}.button-variant-ghost(@color) { .button-color(@color; transparent; @color); &:hover, &:focus { .button-color(~`colorPalette("@{color}", 5)`; transparent; ~`colorPalette("@{color}", 5)`); } &:active, &.active { .button-color(~`colorPalette("@{color}", 7)`; transparent; ~`colorPalette("@{color}", 7)`); } .button-disabled();}

代码中我们可以看到这些函数都是调用button-color来设置按钮的边框，背景，文字颜色，和调用button-disabled来设置禁用样式。主要还是基础颜色样式不同，而且hover，active颜色样式不一样。而且在后面函数中btn-primary、btn-default、btn-ghost、btn-dashed、btn-danger调用上面的对应函数。代码如下：

// primary button style.btn-primary() { .button-variant-primary(@btn-primary-color; @btn-primary-bg);}// default button style.btn-default() { .button-variant-other(@btn-default-color; @btn-default-bg; @btn-default-border); &:hover, &:focus, &:active, &.active { background: @btn-default-bg; text-decoration: none; }}// ghost button style.btn-ghost() { .button-variant-other(@btn-ghost-color, @btn-ghost-bg, @btn-ghost-border);}// dashed button style.btn-dashed() { .button-variant-other(@btn-default-color, @btn-default-bg, @btn-default-border); border-style: dashed;}// danger button style.btn-danger() { .button-variant-danger(@btn-danger-color, @btn-danger-bg, @btn-danger-border);}

剩下就是按钮组的样式和圆按钮的样式

.button-group-base(@btnClassName) {//按钮组的基础样式 position: relative; display: inline-block; > .@{btnClassName}, > span > .@{btnClassName} { position: relative; line-height: @btn-height-base - 2px; &:hover, &:focus, &:active, &.active { z-index: 2; } &:disabled { z-index: 0; } } // size &-lg > .@{btnClassName}, &-lg > span > .@{btnClassName} { .button-size(@btn-height-lg; @btn-padding-lg; @btn-font-size-lg; 0); line-height: @btn-height-lg - 2px; } &-sm > .@{btnClassName}, &-sm > span > .@{btnClassName} { .button-size(@btn-height-sm; @btn-padding-sm; @font-size-base; 0); line-height: @btn-height-sm - 2px; > .@{iconfont-css-prefix} { font-size: @font-size-base; } }}.btn-group(@btnClassName: btn) {//按钮组主要是设置里面一排按钮的边框和圆角 .button-group-base(@btnClassName); .@{btnClassName} + .@{btnClassName}, .@{btnClassName} + &, span + .@{btnClassName}, .@{btnClassName} + span, > span + span, & + .@{btnClassName}, & + & { margin-left: -1px; } .@{btnClassName}-primary + .@{btnClassName}:not(.@{btnClassName}-primary):not([disabled]) { border-left-color: transparent; } .@{btnClassName} { border-radius: 0; } > .@{btnClassName}:first-child, > span:first-child > .@{btnClassName} { margin-left: 0; } > .@{btnClassName}:only-child { border-radius: @btn-border-radius-base; } > span:only-child > .@{btnClassName} { border-radius: @btn-border-radius-base; } > .@{btnClassName}:first-child:not(:last-child), > span:first-child:not(:last-child) > .@{btnClassName} { border-bottom-left-radius: @btn-border-radius-base; border-top-left-radius: @btn-border-radius-base; } > .@{btnClassName}:last-child:not(:first-child), > span:last-child:not(:first-child) > .@{btnClassName} { border-bottom-right-radius: @btn-border-radius-base; border-top-right-radius: @btn-border-radius-base; } &-sm { > .@{btnClassName}:only-child { border-radius: @btn-border-radius-sm; } > span:only-child > .@{btnClassName} { border-radius: @btn-border-radius-sm; } > .@{btnClassName}:first-child:not(:last-child), > span:first-child:not(:last-child) > .@{btnClassName} { border-bottom-left-radius: @btn-border-radius-sm; border-top-left-radius: @btn-border-radius-sm; } > .@{btnClassName}:last-child:not(:first-child), > span:last-child:not(:first-child) > .@{btnClassName} { border-bottom-right-radius: @btn-border-radius-sm; border-top-right-radius: @btn-border-radius-sm; } } & > & { float: left; } & > &:not(:first-child):not(:last-child) > .@{btnClassName} { border-radius: 0; } & > &:first-child:not(:last-child) { > .@{btnClassName}:last-child { border-bottom-right-radius: 0; border-top-right-radius: 0; padding-right: 8px; } } & > &:last-child:not(:first-child) > .@{btnClassName}:first-child { border-bottom-left-radius: 0; border-top-left-radius: 0; padding-left: 8px; }}