Layui text box limits positive integers

 <input type="text" name="Number" lay-verify="required|integer" placeholder="请输入" value="" autocomplete="off" class="layui-input">

layui.use ('form', function () {
             var $ = layui. $ 
                , layer = layui.layer 
                , form = layui.form 

           form.verify ({ 
           integer: [
                / ^ [1-9] \ d * $ / 
               , 'Only enter positive integers' 
           ] 
         }); 
     });