.btn-group > .btn-group:first-child> .btn:last-child, .btn-group > .btn-group:first-child> .dropdown-toggle { border-top-right-radius: 0; border-bottom-right-radius: 0; } 这里是嵌套的btn-group吗?那为什么没有对.btn-group:last-last做border-top-left-radius:0; border-bott
.btn-group > .btn-group:first-child> .btn:last-child, .btn-group > .btn-group:first-child> .dropdown-toggle { border-top-right-radius: 0; border-bottom-right-radius: 0; } 这里是嵌套的btn-group吗?那为什么没有对.btn-group:last-last做border-top-left-radius:0; border-bottom-left-radius:0的设置呢??