21 - 函数式组件

[webfanrc]

<script setup lang='ts'>

import { emit } from "process";
import { ref, h } from "vue"

/**
 * Implement a functional component :
 * 1. Render the list elements (ul/li) with the list data
 * 2. Change the list item text color to red when clicked.
*/
const ListComponent = (props, context) => {
  return h('ul', props.list.map((n, index)=>{
    return h('li', {
      style: {
        color: props['active-index'] == index ? 'red' : ''
      },
      onclick: () => context.emit('toggle', index)
    }, n.name)
  }));
}

const list = [{
  name: "John",
}, {
  name: "Doe",
}, {
  name: "Smith",
}]

const activeIndex = ref(0)

function toggle(index: number) {
  activeIndex.value = index
}

</script>

<template>
  <list-component
    :list="list"
    :active-index="activeIndex"
    @toggle="toggle"
  />
</template>