获取数组中数组

this.permissionList = res.data.payload.auth;
            // 显示问题
             var list=[];
             var lists=[];
             var categorystrss="";
             this.permissionList.forEach(function(d){
              var list=d.list;
               list.forEach(function(s){
                   var lists=s.list;
                   lists.forEach(function(v){
                     if(v.checked==1){
                       categorystrss +=v.auth_id+","
                     }
                  })
              })
            })

 重组数组

categorystrss=categorystrss.substring(0,categorystrss.length-1);
            this.defaultCheckedLeafKeysss=categorystrss.split(",");