vue 2.0 transiton过渡效果异常

Question

vue2.0上做切换过渡时，发现切换显示正常，切换消失时有延时没有过渡效果<transition name='fade'>         <div v-show="isShow" class="detail" >                      </div>         </transition>.detail             position fixed             z-index 100             top 0             left 0             width 100%             height 100%             overflow auto             background rgba(7,17,27,.8)             &.fade-enter-active,&.fade-leave-active                 transition opacity 3s             &.fade-enter,&fade-leave-active                 opacity 0