24 - 激活的样式-指令

[kid1110]

// 你的答案
<script setup lang='ts'>

import { ref, watchEffect } from "vue"

/**
 * Implement the custom directive
 * Make sure the list item text color changes to red when the `toggleTab` is toggled
 *
*/
const VActiveStyle = {
mounted: (el,binding)=>{
  const style = binding.value[0]
  const fn = binding.value[1]
  watchEffect(()=>{
    Object.keys(style).forEach(key=>{
      el.style[key] = fn() ? style[key]: ''
    })
  })
}

}

const list = [1, 2, 3, 4, 5, 6, 7, 8]
const activeTab = ref(0)
function toggleTab(index: number) {
  activeTab.value = index
}

</script>

<template>
  <ul>
    <li
      v-for="(item,index) in list"
      :key="index"
      v-active-style="[{'color':'red'},() => activeTab === index]"
      @click="toggleTab(index)"
    >
      {{ item }}
    </li>
  </ul>
</template>