下拉菜单的两种默认用法

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下拉菜单的两种用法----------详见上一目录word文档

                 用法一：

<?php

//echo$_POST['classes'];

  $a=4;

?>

<form name="form1" method="post">

  <select name="classes">

     <option name="0" selected>请选择班级</option>

     <option name="1" >0801</option>

     <option name="2">0802</option>

     <option name="3" <?if($a==3)echo"selected" ?>>0803</option>

     <option name="4" <?if($a==4)echo"selected" ?>>0804</option>

  </select>

</form>

                  用法二：

<form name="form1" method="post">

  <select name="classes">

     <option name="0" selected>请选择班级</option>

     <option name="1" >0801</option>

     <option name="2">0802</option>

                                              <option name="3">0803</option>

                                           </select>

                                         </form>