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HTML

              
                 <h2>JavaScript localStorage</h2>
<p>文字をSaveし、ブラウザを再読み込みしたらLoadをクリック下さい、保存されたデータの削除も用意してあります。</p>
    <textarea id="myTextarea" rows="10" cols="50"></textarea>
    <p>削除したらLoadボタンをクリックします、クリア後は値が空になっていることが確認できます
</p>
    <button onclick="localSave()">Save</button>
    <button onclick="localLoad()">Load</button>
    <button onclick="localRemove()">Remove</button>
              
            
!

CSS

              
                button {
  border-radius: 10px;
  margin: 10px;
  background-color: #0066FF;
  color: #fff;
  width: 200px;
  padding: 10px;
}
              
            
!

JS

              
                //入力された値を保存
const localSave = () => {
const myContent = document.getElementById("myTextarea").value;
localStorage.setItem("key", myContent);

alert(myContent)

      }

//保存されたデータを呼び出す
const localLoad = () => {
const myContent = localStorage.getItem("key");
document.getElementById("myTextarea").value = myContent;
  
alert(myContent)
      }

//保存されたデータ全て削除
const localRemove = () => {
document.getElementById("myTextarea").value = "";
localStorage.clear();


alert("データは削除されました");

}



              
            
!
999px

Console