<h1>아래 버튼을 눌러보세용!</h1>
<button onclick="alertdialog()">나를 눌러라 휴먼</button>
button {
  width:200px;
  font-size:14pt;
}
function alertdialog() {
  alert('핫핫핫 나를 눌렀느냐!');
}
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