JS判断不能为空实例代码

前端技术 2023/09/08 JavaScript
复制代码 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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