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JS判断不能为空实例代码

  • 时间:2022-12-15 03:24 编辑: 来源: 阅读:
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摘要:JS判断不能为空实例代码
[u]复制代码[/u] 代码如下:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> <html xmlns="http://www.w3.org/1999/xhtml">     <head>         <meta http-equiv="Content-Type" content="text/html"; charset="utf-8">         <title>短信系统</title> <script language="javascript">                function formcheck(){             if(document.form.zhanghao.value==""){                 alert("号码不能为空!");                 this.form1.zhanghao.focus();                 return false;             }else if(document.form.email.value==""){                 alert("内容不能为空!")                 this.form1.eamil.focus();                 return false;             }else form1.submit();  }         </script>     </head>     <body>         <form name="form" method="post" action="sendmail.php" class="formg">             <table>                 <h2>                     <tr>                         <th colspan="8" class="CTitle">发送短信</th>                     </tr>                 </h2>                 <body>                         <tr bgcolor="#eeeeee">                             <td align="center">号   码:</td>                             <td><textarea name="content" cols="80" rows="15" id="zhanghao" class="formh"></textarea></td>                         </tr>                         <tr bgcolor="#eeeeee">                             <td align="center">内   容:</td>                             <td><textarea name="content" cols="80" rows="15" id="email" class="formh"></textarea></td>                         </tr>                         <tr bgcolor="#eeeeee" align="center">                 <td height="25" colspan="2">                     <input type="button" name="Submit" value="发 送" class="button" onClick="javascript:formcheck();">                           <input type="reset" name="Submit2" value="重 置" class="button">                 </td>                         </tr>                 </body>             </table>         </form>     </body> </html>
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