// 默认
.v-enter-active,
.v-leave-active {
    transition: opacity .3s ease;
}

.v-enter,
.v-leave-active {
    opacity: 0;
}

.fade-enter-active,
.fade-leave-active {
    transition: opacity .3s ease;
}

.fade-enter,
.fade-leave-active {
    opacity: 0;
}

.fade-out-leave-active {
    transition: opacity .5s ease;
}

.fade-out-leave-to {
    opacity: 0;
}

.drop-enter-active,
.drop-leave-active {
  transition: all 0.15s ease;
  transform-origin: center top;
}

.drop-enter,
.drop-leave-active {
  transform: scaleY(0);
}