form表单提交不成功提示

时间：2023-03-09 00:07:22
form表单提交不成功提示 
<!DOCTYPE html>

<html lang="zh-CN">

    <head>

        <meta charset="utf-8">

        <title>Form 校验</title>

        <script>

            function CheckForm(form) {

                if(form.username.value == "") {

                    alert('名字总要填一个吧！');

                    form.username.focus();

                    return false

                }

            return true;

            }

        </script>

    </head>

    <body>

        <form name="form1" id="form1" action="" method="post" onsubmit="CheckForm(this)">

            <input type="text" name="username">

            <input type="submit" value=" 提交">

        </form>

    </body>

</html>

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