JavaScript document write String content writes nothing o_javascipt string conten-优快云博客

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The following html will output nothing on html page, you may meet it before.

<html><head>    <title>Tmp HTML</title>    <script type="text/javascript">        document.write(String.fromCharCode(0x204A));    </script></head><body></body></html>

Why nothing displayed? It is because bothdocument.write and document.writeln method output text into anunready (open) document. That is to say, when the page finishes loading, the document becomesclosed. An attempt to document.write in it will cause the contents to be erased.

You can work around as following:

<html><head>    <title>Tmp HTML</title>    <script type="text/javascript">        function MyDocumentWrite() {            document.write(String.fromCharCode(0x204A));        }        window.onload = MyDocumentWrite;    </script></head><body></body></html>