質問編集履歴
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```
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##追記2
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[ドキュメント](https://vue-chartjs.org/#/home?id=reactive-data)より
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On data change, it will either call update() if only the data inside the datasets has changed or renderChart() if new datasets were added.
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とあるのでdatasetsの変更にも対応しているのではと思っています
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### 補足情報（FW/ツールのバージョンなど）
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[vue-chartjsのgithub](https://github.com/apertureless/vue-chartjs)
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##追記
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```html
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<button @click="clicked">ボタン</button>
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<p>{{datacollection}}</p>
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clicked(){
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this.$set(datacollection, 'datasets', [
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{
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label: '得票数',
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data: [3, 3, 13, 15, 12, 13],
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backgroundColor: [
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'rgba(0, 99, 132, 0.2)',
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'rgba(54, 162, 235, 0.2)',
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'rgba(0, 206, 86, 0.2)',
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'rgba(75, 192, 192, 0.2)',
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'rgba(153, 102, 0, 0.2)',
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'rgba(0, 159, 64, 0.2)',
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],
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borderColor: [
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'rgba(255,99,132,1)',
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'rgba(54, 162, 235, 1)',
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'rgba(255, 206, 86, 1)',
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'rgba(75, 192, 192, 1)',
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'rgba(153, 102, 255, 1)',
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'rgba(255, 159, 64, 1)',
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],
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borderWidth: 1,
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},
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}
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//としたところ、これはpタグの内容が更新されました
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//chartは相変わらず変わりません
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```
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