[TOC] ### 数值转整形 extend / helper.js ~~~ 'use strict'; module.exports = { parseInt(string) { if (typeof string === 'number') return string; if (!string) return string; return parseInt(string) || 0; }, }; ~~~ ### 筛选字段 ``` filterFields(field) { const fields = field.split(';').filter(f => f); return fields.length === 0 ? '' : fields; } const { field = '' } = ctx.query const fields = ctx.helper.filterFields(field) ```