<script>
function check(){
var dd = ""; 
if($("input[type=‘checkbox‘][name=‘mokedoc‘]:checked").attr("checked")){//选中了
   $(‘input:checkbox[name="mokedoc"]:checked‘).each(function()
   {
        alert($(this).val());
    dd += $(this).val()+" ";
    $("#dds").val(dd);
   }); 
}else{$("#dds").val("");} 
}  
</script>  
 <input type="checkbox" name="mokedoc" value="11" onclick="check()"/>1231  
 <input type="checkbox" name="mokedoc" value="12" onclick="check()"/>2342
 <input type="checkbox" name="mokedoc" value="14" onclick="check()"/>3343
 <input type="checkbox" name="mokedoc" value="15" onclick="check()"/>5213 
 <input name="dds" id="dds" value="" type="text" />