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<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width">
</head>
<body>
    <button id="btn1">按鈕一</button><br>
    <button id="btn2">按鈕二</button><br>
    <div id="console"></div>
<script type="text/javascript">
    function handler() {
        document.getElementById('console').innerHTML 
            = `Who's clicked: ${this.id}`;
    }
    document.getElementById('btn1')
            .addEventListener('click', handler, false);
    document.getElementById('btn2')
            .addEventListener('click', handler, false);
</script>  
  
</body>
</html>
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public
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JustinSDKpro
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