x
1
2
<html>3
<head>4
<script>5
function myFunction() {6
alert("Hello World!");7
}8
</script>9
</head>10
11
<body>12
<button onclick="myFunction()">Try it</button>13
</body>14
</html>
<html><head> <script> function myFunction() { alert("Hello World!"); } </script></head><body> <button onclick="myFunction()">Try it</button></body></html>