js自动选择表单

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<!DOCTYPE html><html><head>    <meta charset="UTF-8" />    <title>Document</title>    <script type="text/javascript">         window.onload = function(){            var txt = document.getElementById("txt");            txt.<span style="color:#ff0000;">onmouseover</span> = function(){                txt.select();            }         }    </script></head><body>    <form action="demo.php">        <input type="text" id="txt" />        <input type="submit" />    </form></body></html>

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