26 - 实现简易版`v-model`指令

[webfanrc]

<script setup lang='ts'>

import { ref, watchEffect } from "vue"

/**
 * Implement a custom directive
 * Create a two-way binding on a form input element
 *
*/
const VOhModel = {
  mounted(el, binding) {
    watchEffect(() => {
      el.value = binding.value
      el.addEventListener('input',(e)=>{
        value.value=e.target.value
      })
    })
  }
}

const value = ref("Hello Vue.js")

</script>

<template>
  <input v-oh-model="value" type="text" />
  <p>{{ value }}</p>
</template>