hello world
      
      
          
hello world
      
      Add
  
  
      Vue.component('fade',{
          props:['show'],
          template:'<transition @before-enter="handleBeforeEnter" @enter="handleEnter">' +
          '<slot v-if="show"></slot></transition>',
          methods:{
              handleBeforeEnter:function (el) {
                  el.style.color='red'
              },
              handleEnter:function (el,done) {
                  setTimeout(()=>{
                      el.style.color ='blue',
                      done()
                  },2000)
              }
          }
      })
      var count =0;
      var vm =new Vue({
          el:"#app",
          data:{
              show:false
          },
          methods:{
              handleBtnClick:function () {
                  this.show=!this.show
              }
          }
      })