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docs: ウォッチャーのサンプルを少し親切にする #327

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merged 3 commits into from
Dec 6, 2023
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docs: ウォッチャーのサンプルを少し親切にする #327

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docs: ウォッチャーのサンプルを少し親切にする
knokmki612 Dec 6, 2023
bbe1802
ci: format
github-actions[bot] Dec 6, 2023
3b6c99b
Update slides.md
knokmki612 Dec 6, 2023
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9 changes: 6 additions & 3 deletions docs/slides.md
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Original file line number Diff line number Diff line change
Expand Up @@ -470,18 +470,21 @@ const randomComputed = computed(() => {

```vue
<script setup>
import { ref, computed, watch } from "vue";
import { ref, watch } from "vue";

const count = ref(1);
const histories = ref([[count.value, null]]);
// 今の値とひとつ前の値の配列のリアクティブな値
const histories = ref([{ current: count.value, prev: null }]);
watch(count, (current, prev) => {
histories.value.splice(0, 0, [current, prev]);
// 配列の先頭に値を追加する
histories.value.splice(0, 0, { current, prev });
});
</script>

<template>
<div>
<input type="number" v-model="count" />
<h3>値の履歴（nステップ前の値が表示されます）</h3>
<ol start="0">
<li v-for="(history, index) in histories" :key="index">
今の値: {{ history[0] }}、前の値: {{ history[1] ?? "なし" }}
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