php页面传值参数返回值的例子

<script type="text/javascript">  
function getsel(){ 
    var obj = document.getElementById("sel").value; 
    if(obj== ""){ 
        obj = "0"; 
    } 
    var newhref = "b.php?obj="+obj; 
    var ona = document.getElementById('ona'); 
    ona.href = newhref; 
} 
 
</script> 
<select id="sel"> 
      <?php foreach ($sql_res as $value) { ?> 
<option value="<?php echo $value[belongs];?>"><?php echo $value[belongs];?></option> 
 <?php };?> 
</select> 
 
<a id='ona' href="" target="_blank" onclick="getsel()">传值</a> 

<?php 
$obj = $_REQUEST['obj']; 
echo $obj; 
?>