for(var i=0;i<event.selected.length;i++){

          var current=event.selected[i].choosed[0];

          var current_=event.selected[i].choosed[1]

          var here='sort.class.'+String(current)+'.2'

          goods.doc(event.selected[i].detail._id).update({

            data:{

              here:_.inc(-current_),//这里的here我就是想用上面的那个here里的值来代替，因为我要更新的值是局部的而且是要动态改变的

            },

            success:res=>{

              console.log(res)

            },

            fail:err=>{

              console.log(err)

            }

          });

        };