docs: function fakeAjax(startIndex, itemPerPage) {
    const db = [
      {
        danjubianhao: '263X2016111400000081',
        jine: '2.00'
      },
      {
        danjubianhao: 'D32016091200000022',
        jine: '12.00'
      },
      {
        danjubianhao: '263X20160830000000345',
        jine: '100.00'
      },
      {
        danjubianhao: '263X2016083000002340025',
        jine: '10430.00'
      },
      {
        danjubianhao: '263X201608300005600025',
        jine: '1400.00'
      },
      {
        danjubianhao: '263X2016083000567000025',
        jine: '1070.00'
      },
      {
        danjubianhao: '263X2016083000234000025',
        jine: '1800.00'
      }
    ];
    let index;
    let items = [];
    for (index = startIndex; index < (startIndex + itemPerPage); index++) {
      if (!db[index]) continue;
      items.push(db[index]);
    }
    return {
      items,
      totalItems: db.length
    };
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