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vueのウォッチャー

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vueのdateオプションで登録した値になんらかの変更があった際に、実行したい処理がある場合はウォッチャーを使用します。

new Vue({
  watch: {
    // 監視を行うデータ
    todos: {
      // 変化した時に行いたい処理
      handler: function(todos) {
        todoStorage.save(todos)
      },
    }
  }
})
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