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                <html lang="ja">
  <meta charset="utf-8">
  <script src="sample.js"></script>
  <input type="button" value="入力ダイアログを表示する" onclick="kakuyomu_kusa_graph();">




                function kakuyomu_kusa_graph(){
  var gatsu = window.prompt("執筆したMonthは?", "");
  var nichi = window.prompt("執筆したDayは?", "");
  var result = window.prompt("文字数は?", "");

  if(result == null){
      window.alert("カクヨムユーザの imagawatatsuyaさんは、2019年" + gatsu + "月" + nichi + "日" + "に" + result + "字を書きました"  + " /");  }