加上下面这段就报错了

if (this.data.minusnum > 0) {

      var lastnum = this.data.allnum - this.data.minusnum

      kindshow.where({

        title:this.data.tag

      }).update({

        data:{

          lastnum:lastnum

        }

      })

    };

错误如下

VM61:1 thirdScriptError

errCode: -1  | errMsg: query.update is only available in server SDK / API; [Component] Event Handler Error @ pages/write/write#bound create

Error: errCode: -1  | errMsg: query.update is only available in server SDK / API

    at new u (WAService.js:1:128214)

    at n.Za.n.update (WAService.js:1:386263)

这个表插入数据时没有问题，为什么update就不行？？、