代码来自官方

uiUpload.add({
  quality:1,
           onSuccess: function(file){
               this.toBase64({
                   onSuccess: function (url) {
                    $("#btnUpload").find('.span1').text('重新上传');
                    upload_pic(url);
                   }
               });
           }
       })

function upload_pic(base64){
          var image = new Image();
          image.src = base64;
          image.onload = function() {
            var resized = resizeUpImages(image);
            var severUrl = "/index.php/index/attachment/upload/dir/images/from/base64/module/bbs.html";
            $.post(severUrl, {'imgBase64':resized,'Orientation':'','tags':''}).done(function (res) {
              if(res.code==1){
                //console.log(res);
                var url = res.path;
                if(url.indexOf('://')==-1 && url.indexOf('/public/')==-1){
                  url = '/public/'+url;
                }
$(".uselimg").html('');
$(".uqrcode").val(url);
console.log(url)
              }else{
                alert(res.info);
              }
            }).fail(function () {
              alert('操作失败，请跟技术联系');
            });
          }
        }

        function resizeUpImages(img) {
          //压缩的大小
          var max_width = 1920; 
          var max_height = 1080; 
          var canvas = document.createElement('canvas');
          var width = img.width;
          var height = img.height;
          if(width > height) {
            if(width > max_width) {
              height = Math.round(height *= max_width / width);
              width = max_width;
            }

          }else{
            if(height > max_height) {
              width = Math.round(width *= max_height / height);
              height = max_height;
            }
          }
          canvas.width = width;
          canvas.height = height;
          var ctx = canvas.getContext("2d");
          ctx.drawImage(img, 0, 0, width, height);
          //压缩率
          return canvas.toDataURL("image/jpeg",0.72); 
        }

请教一下：其中

var severUrl = "/index.php/index/attachment/upload/dir/images/from/base64/module/bbs.html";

这个地址有什么规律吗？或者说在有需要上传图片的页面，怎么找到图片的上传地址呢？感谢各位！