一个关于strus标签和javascript的判定小问题 急求解答！

Question

    <script type="text/javascript">
    function check(){
       var username = document.LoginForm.username.value;
       var password = document.LoginForm.password.value;
       if(username==""){
          alert("用户名不可以为空！");
       }else(password==""){
          alert("密码不可以为空！");
       }
    }
</script>
    jsp代码
                    <html:form action="Login.do">
                      <logic:notPresent name="user">
                          <div align="center" class="text">
                             <bean:message key="index.username"/>用户名
                                 <html:text property="username" styleClass="login">
                             </html:text><br>
                             
                             <bean:message key="index.password"/>密码
                                 <html:password property="password" styleClass="password">
                             </html:password><br>
                                    Strus-Config.xml本表单的form配置        <form-bean name="LoginForm" type="com.book.model.User">
         <form-property name="username" type="String"></form-property>
         <form-property name="password" type="String"></form-property>
        </form-bean>
问题是 我怎么样判定用户名和密码的框框是空的 从而用javascript判定出来？再用alert判断出来？用原始的form可以的，现在好像不知道怎么用了...谢谢...O(∩_∩)O

Answer 1