获取select值及判断是否是数字

代码片段

 <div class="container-fluid">
     <div class="row">
         <div class="col-md-6 col-md-offset-3">
             <div class="panel panel-default m-top">
                 <div class="panel-heading">添加</div>
                 <div class="panel-body">
                     <form method="" action="" class="form-horizontal">
                         <div class="form-group form-group-sm">
                             <label for="productNos" class="col-sm-4 control-label">名称：</label>
                             <div class="col-sm-4">
                                 <select name="productNo" id = "productNos" class="form-control">
                                     <option value="">--请选择--</option>
                                     <option value="010">动联</option>
                                     <option value="009">BBPOS</option>
                                     <option value="008">天喻</option>
                                     <option value="007">江苏怡丰</option>
                                     <option value="006">赢联</option>
                                     <option value="005">华中星（鼎合）</option>
                                     <option value="004">新大陆</option>
                                     <option value="003">智嘉</option>
                                     <option value="002">升腾</option>
                                     <option value="001">艾创</option>
                                 </select>
                             </div>
                             <div class="col-sm-4">
                                 <span class="msg1"></span>
                             </div>
                         </div>
                         <div class="form-group form-group-sm">
                             <label for="proNum" class="col-sm-4 control-label">数量：</label>
                             <div class="col-sm-4">
                                 <input type="text" id="proNum" name="proNum"  class="form-control" />
                             </div>
                             <div class="col-sm-4">
                                 <span class="msg2"></span>
                             </div>
                         </div>
                         <div class="col-sm-offset-4">
                             <button type="submit" class="btn btn-primary btn-sm" onclick="return create();">
                                 <i class="glyphicon glyphicon-saved"></i>
                                 <span>保存</span>
                             </button>
                             <button onclick="back();" class="btn btn-sm btn-danger" type="button">
                                 <i class="glyphicon glyphicon-remove-circle"></i>
                                 <span> 取消</span>
                             </button>
                         </div>
                     </form>
                 </div>
             </div>
         </div>
     </div>
 </div>

 <script type="text/javascript">
 function create(){
     var productNo = $("#productNos").val(); // 获取select 的value值
     if(productNo == ""){
         layer.msg("请选择厂家名称!\r\n", {title: '提示框',icon:0,shade: [0.5],scrollbar: false});
         return false;
     }
     var proNum = $("#proNum").val();
     if(proNum == ""){
         layer.msg("请输入数量!\r\n", {title: '提示框',icon:0,shade: [0.5],scrollbar: false});
         return false;
     }else{
         if(isNaN(proNum)){ // 如果是数字则返回 false
             layer.msg("请输入数字!\r\n", {title: '提示框',icon:0,shade: [0.5],scrollbar: false});
             return false;
         }
     }
 }
 </script>