<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>起動時の処理</title>
</head>
<body>

<p>起動時の処理</p>

<div id="div01">original </div>

<script type="text/javascript">
window.addEventListener("load",main);
document.getElementById("div01").innerHTML += "01";

function main() {
	document.getElementById("div01").innerHTML += "05";
}
</script>
</body>
</html>