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為什么會出現警告未定義屬性值

為什么我寫時候placeholder和required會出現警告未定義屬性值啊,下面的的input也有,但運行有沒有錯

落于寒4180575

2016-12-06

源自：Duang~MySQLi擴展庫來襲 2-7

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2 回答

慕粉3173334
2017-01-04

placeholder和required是H5支持的

0 回復有任何疑惑可以回復我~

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落于寒4180575 提問者
2016-12-06

<!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" xml:lang="en">
<head>
?? ?<meta http-equiv="Content-Type" content="text/html;charset=UTF-8" />
?? ?<title>Document</title>
</head>
<body>
??? <h2>添加用戶</h2>
??? <form action = "doAction.php?act = addUser" method = "post">
??????? <table border = "1" cellpadding = "0" cellspacing = "0" width = "80%" bgcolor = "#ABCDEF">
??????????? <tr>
?? ??? ??? ??? ?<td>用戶名</td>
?? ??? ??? ??? ?<td><input type="text" name="username" id=""? placeholder='請輸入合法用戶名' required='required'/></td>
?? ??? ??? ?</tr>
?? ??? ??? ?<tr>
?? ??? ??? ??? ?<td>密碼</td>
?? ??? ??? ??? ?<td><input type="password" name="password" id=""? placeholder='請輸入密碼' required='required'/></td>
?? ??? ??? ?</tr>
?? ??? ??? ?<tr>
?? ??? ??? ??? ?<td>年齡</td>
?? ??? ??? ??? ?<td><input type="number" name="age" id="" min='1' max='125' placeholder='請輸入合法年齡' required='required'/></td>
?? ??? ??? ?</tr>
?? ??? ??? ?<tr>
?? ??? ??? ????? <td? colspan = '2'><input type = "submit" value = "添加用戶"/></td>
?? ??? ??? ?</tr>
??????? </table>
??? </form>
</body>
</html>