html js_cc_08_add_event2

Posted 2021-05-10

    function event_alert(){
      alert("ボタンが押されました");
    }
    var button = document.getElementById("alert");
    button.addEventListener('mouseover', event_alert, false);

js_cc_08_add_event2
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A [Pen](https://codepen.io/m-shinkawa/pen/aKOOQx) by [m-shinkawa](https://codepen.io/m-shinkawa) on [CodePen](https://codepen.io).

[License](https://codepen.io/m-shinkawa/pen/aKOOQx/license).

  <button id="alert">アラート</button>