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v-on:clickの使い方のサンプルになります。
ボタンをクリックするとカウントが1ずつ上がります。

index.html
<!DOCTYPE html>
<html lang="ja">
  <head>
    <meta charset="UTF-8">
    <title>カウントアップ</title>
    <script src="https://unpkg.com/vue@next"></script>
  </head>

  <body>
    <div id="app1">
      <p> {{ count }}回クリックしました。</p>
      <button v-on:click="increment">カウントを増やす</button>
    </div>

    <script>
      const App1 = {
        data() {
          return {
            //初期値を定義
            count: 0
          }
        },
        methods: {
          increment: function(){
          //count変数に+1する
          this.count += 1;
          }
        }
      }

      app1 = Vue.createApp(App1)
      app1.mount('#app1')

    </script>
  </body>
</html>

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