// 缩放动画工具
.animate-scale(@animation_name: animation-scale, @start: 0, @end: 1, @duration: 3s, @easing: ease-in-out, @delay: 0s, @loop: infinite, @repeat: alternate) {
    .animation(@animation_name @duration @easing @delay @loop @repeat);

    & when (@prefix = true) {
        @-webkit-keyframes @animation_name { .keyframes('-webkit-'); }
        @-moz-keyframes @animation_name { .keyframes('-moz-'); }
    }

    @keyframes @animation_name { .keyframes; }

    .keyframes(@prefix: '') {
        @pf: e('@{prefix}');
        from { @{pf}transform: scale(@start); }
        to   { @{pf}transform: scale(@end);   }
    }
}