vue自带的 transition name="slide-fade" 设置动画

<transition name="slide-fade"> 
      <div ref="treeWrap" class="orgBox" v-show="isShow" @mouseout="hideOrg" @mouseover="ShowOrgs">
          <elTree :lazy="propLazy"  :request="propTreeRequest" :node.sync="syncNode" @hideTree="hideTree"></elTree>
      </div>
    </transition>

.slide-fade-enter-active {
  transition: all .25s linear;
}
.slide-fade-leave-active {
  transition: all .25s linear;
}
.slide-fade-enter, .slide-fade-leave-to
/* .slide-fade-leave-active for below version 2.1.8 */ {
  transform: translateY(100px);
  opacity: 0;
}