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JavaScriptによる共通HTMLの挿入

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JQueryを使わずにheader・footerなどの共通のHTML文をJavaScriptで挿入する方法です。
といっても、innerHTMLで挿入するだけなんですけどね・・・

HTML

index.html
<!DOCTYPE html>
<html>
<head>
    <title>innerTest</title>
    <script type="text/javascript">
        function header(){
        var h = document.getElementById("header");
        h.innerHTML = "HelloWorld";
    }
    </script>
</head>
<body>
    <div id="header"></div>
    <script type="text/javascript">header();</script>
</body>
</html>

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