<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" />