多项加减

图：

html代码

 <p class="ro" style=" height: auto">
     <label> 产品</label>
     <q style="display: block; margin-left: 130px;"  id="pro_1">
         <i id="select_val" style="display: none">{$pro_all}</i>
         <span>
               <i><b id="pro_add">[+]&nbsp;</b> 
                   <select name="pro_name[]" id="pro_name[]">
                   {$pro_all}
                   </select>
                </i>
                <i><input name="pro_num[]" value="" id="pro_num[]" class="ro_num" /> 台</i>
          </span>
      </q>
                    
</p>

js代码

<script type="text/javascript">
$(document).ready(function(){
    // 增加选项
    $("#pro_add").click(function(){
        $(text()).appendTo("#pro_1");
    });
        
    
    
});

function pro_del(obj){
    //var o = document.getElementById("pro_1").getElementsByTagName("span").length;
    var o = $("#pro_1 span.pro_d").length;
    div = "num_"+obj;
    //alert(obj);
    $("#pro_1 span."+div).remove();
    
}
function text(){
    var sel_val = document.getElementById("select_val").innerHTML;
    //alert(v);
    var o = $("#pro_1 span.pro_d").length;
    var num = o+1;
    var html = "<span class='pro_d num_"+num+"'><i><b class='pro_del' onclick='pro_del("+num+")'>[-]&nbsp;&nbsp; </b><select name='pro_name[]'>"+sel_val+"</select> </i><i><input name='pro_num[]' value='' id='' class='ro_num' /> 台</i></span>";
    return html;    
}


</script>