first of all, the source code is like this

input(v-model="num" @keyup="search") -sharp 
.prompt(v-show="lists!=0") -sharp 
  .list(v-for="(i,n) in lists" :key="n") {{i.name}}

how vue listens to let the prompt index box hide when the input box loses focus

prompt there is already a v-show on the body. If you add another event, who should add it to