前端分页查询方法

export const getTableDataPage = (param, dataArrys) => {
    // param分页查询参数，dataArrys分页数据
  return new Promise((resolve) => {
    const { pageNum, pageSize, condition } = { ...param }
    // 先查询符合条件的数据
    let isSearchForm = false
    const searchData = []
    for(let key in condition) {
      if (condition[key]) {
        isSearchForm = true
      }
    }
    if (isSearchForm) {
      dataArrys.forEach(item => {
        let isEqual = true
        for(let key in condition) {
          if (condition[key] && item[key] !== condition[key]) {
            isEqual = false
          }
        }
        if (isEqual) {
          searchData.push(item)
        }
      })
      dataArrys = searchData
    }
    // 再做分页，返回数据
    const startIndex = pageNum === 1 ? pageNum-1: (pageNum-1)*10
    const endIndex = startIndex + pageSize
    let total = 0
    let records = []
    if (dataArrys) {
      total = dataArrys.length
      records = dataArrys.slice(startIndex, endIndex)
    }
    const pages = Math.ceil(total / pageSize)
    const response = {
      pageNum: pageNum,
      pageSize: pageSize,
      pages: pages,
      data: records,
      total: total,
    }
    resolve(response)
  })
}