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網頁中實現複製功能

<!DOCTYPE HTML PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
    <meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
    <title>無標題文件</title>
</head
>
<body> <table width="600" border="0" cellspacing="0" cellpadding="0"> <tr> <td> <script> function copyit() { document.all.text.select(); document.execCommand("copy"); alert("成功複製文字1"); }</script> <textarea name="text" cols
="40" rows="5">
</textarea> <input name="select" type="button" onclick=" copyit()" value="複製1" /> </td> <td> <script> function copyit2() { document.all.text2.select(); document.execCommand("copy"); alert("成功複製文字2"
); }
</script> <textarea name="text2" cols="40" rows="5"></textarea> <input name="select2" type="button" onclick=" copyit2()" value="複製2" /> </td> </tr> <tr> <td> <script> function copyit3() { document.all.text3.select(); document.execCommand("copy"); alert("成功複製文字3"); }</script> <textarea name="text3" cols="40" rows="5"></textarea> <input name="select3" type="button" onclick=" copyit3()" value="複製3" /> </td> <td> <script> function copyit4() { document.all.text4.select(); document.execCommand("copy"); alert("成功複製文字4"); }</script> <textarea name="text4" cols="40" rows="5"></textarea> <input name="select4" type="button" onclick=" copyit4()" value="複製4" /> </td> </tr> </table> </body> </html>