19 - 切换焦点指令

[nanzi13]

// 你的答案
<script setup lang='ts'>
import { ref } from "vue"

const state = ref(false)

/**
 * Implement the custom directive
 * Make sure the input element focuses/blurs when the 'state' is toggled
 *
*/

const VFocus = (el, binding) => {
  if (binding.value) {
    el.focus()
  } else el.blur()
}

setInterval(() => {
  state.value = !state.value
}, 2000)

</script>

<template>
  <input v-focus="state" type="text">
</template>