用php验证:  
1. 在plus/diy.php 的第 40行下加  
//增加必填字段判断
if($required!=''){
if(preg_match('/,/', $required))
    {
        $requireds = explode(',',$required);
        foreach($requireds as $field){
            if($$field==''){
                showMsg('带*号的为必填内容，请正确填写', '-1');
                exit();
            }
        }
    }else{
        if($required==''){
            showMsg('带*号的为必填内容，请正确填写', '-1');
            exit();
        }
    }
}
//end

2.在模版的表单里加  <input type="hidden" name="required" value="name,qq" />
value  就是必须字段  多个用 , 隔开。

案例分享：

<form action="/plus/diy.php" enctype="multipart/form-data" method="post">
<input type="hidden" name="required" value="name,qq" /> 
<input type="hidden" name="action" value="post" />
<input type="hidden" name="diyid" value="1" />
<input type="hidden" name="do" value="2" />
<table style="width:97%;" cellpadding="0" cellspacing="1">
<tr>
  <td align="right" valign="top">姓名：</td>
  <td><input type='text' name='name2' id='name2' style='width:250px'  class='intxt' value='' />
</td>
</tr>
<tr>
  <td align="right" valign="top">性别：</td>
  <td><select name='sex2' style='width:50px'><option value='男'>男</option>
<option value='女'>女</option>
</select>
</td>
</tr>
<tr>
  <td align="right" valign="top">电话：</td>
  <td><input type='text' name='tell2' id='tell2' style='width:250px'  class='intxt' value='' />
</td>
</tr>
<tr>
  <td align="right" valign="top">地址：</td>
  <td><input type='text' name='add' id='add' style='width:250px'  class='intxt' value='' />
</td>
</tr>
<tr>
  <td align="right" valign="top">备注内容：</td>
  <td><input type='text' name='con2' id='con2' style='width:250px; height:100px'  class='intxt' value='' />
</td>
</tr>
<input type="hidden" name="dede_fields" value="name2,text;sex2,select;tell2,text;add,text;con2,text" />
<input type="hidden" name="dede_fieldshash" value="78764e448024ba3607705cbf961ebf3f" /></table>
<div align='center' style='height:30px;padding-top:10px; padding-left:130px'>
<input type="submit" name="submit" value="提 交" class='coolbg' />
&nbsp;
<input type="reset" name="reset" value="重 置" class='coolbg' />
</div>
</form>