Page({
  data: {
    historyList: []
  },

  onShow() {
    const list = wx.getStorageSync('CALC_HISTORY') || [];
    this.setData({
      historyList: list
    });
  },

  clearHistory() {
    wx.showModal({
      title: '提示',
      content: '确定要清空所有记录吗？',
      success: (res) => {
        if (res.confirm) {
          wx.removeStorageSync('CALC_HISTORY');
          this.setData({
            historyList: []
          });
        }
      }
    });
  }
});