refactor: ES6+ modernization + 2 bugfixes

- var→const/let, function→arrow/class across all 13 JS files
- Timer: prototype→class with ES6 getters
- plan days: IIFE→Array.from declarative generation
- storage/plan: unified formatDate via util.js
- Bugfix: getPlanDay now filters by planId (plan switch accuracy)
- Bugfix: getTodayRecord searches all months (cross-month boundary)
- WXML/WXSS unchanged; public API unchanged

pages/records/records.js

@@ -1,6 +1,6 @@
-var storage = require('../../utils/storage')
-var util = require('../../utils/util')
-var themeMod = require('../../utils/theme')
+const storage = require('../../utils/storage')
+const util = require('../../utils/util')
+const themeMod = require('../../utils/theme')
 
 Page({
   data: {
@@ -19,36 +19,31 @@ Page({
     dayDetail: {}
   },
 
-  onLoad: function () {
+  onLoad() {
     this.refresh()
   },
 
-  onShow: function () {
+  onShow() {
     themeMod.applyThemeToPage(this)
     try {
-      var tb = this.getTabBar()
+      const tb = this.getTabBar()
       if (tb) tb.setData({ selected: 1 })
     } catch (e) {}
     this.refresh()
   },
 
-  onPullDownRefresh: function () {
+  onPullDownRefresh() {
     this.refresh()
     wx.stopPullDownRefresh()
   },
 
-  refresh: function () {
-    var stats = storage.getTotalStats()
-    var monthKey = this.data.currentYear + '-' +
-      (this.data.currentMonth < 10 ? '0' : '') + this.data.currentMonth
-    var records = storage.getRecordsByMonth(monthKey)
+  refresh() {
+    const stats = storage.getTotalStats()
+    const monthKey = `${this.data.currentYear}-${String(this.data.currentMonth).padStart(2, '0')}`
+    const records = storage.getRecordsByMonth(monthKey)
 
-    var allRecords = []
-    var all = storage.getRecords()
-    Object.keys(all).forEach(function (key) {
-      allRecords = allRecords.concat(all[key])
-    })
-    allRecords.sort(function (a, b) { return b.date.localeCompare(a.date) })
+    const allRecords = Object.values(storage.getRecords()).flat()
+    allRecords.sort((a, b) => b.date.localeCompare(a.date))
 
     this.setData({
       totalDuration: stats.totalDuration,
@@ -61,48 +56,38 @@ Page({
     })
   },
 
-  onPrevMonth: function () {
-    var year = this.data.currentYear
-    var month = this.data.currentMonth
-    if (month === 1) {
-      year--
-      month = 12
+  onPrevMonth() {
+    let { currentYear, currentMonth } = this.data
+    if (currentMonth === 1) {
+      currentYear--
+      currentMonth = 12
     } else {
-      month--
+      currentMonth--
     }
-    this.setData({ currentYear: year, currentMonth: month })
+    this.setData({ currentYear, currentMonth })
     this.refresh()
   },
 
-  onNextMonth: function () {
-    var year = this.data.currentYear
-    var month = this.data.currentMonth
-    if (month === 12) {
-      year++
-      month = 1
+  onNextMonth() {
+    let { currentYear, currentMonth } = this.data
+    if (currentMonth === 12) {
+      currentYear++
+      currentMonth = 1
     } else {
-      month++
+      currentMonth++
     }
-    this.setData({ currentYear: year, currentMonth: month })
+    this.setData({ currentYear, currentMonth })
     this.refresh()
   },
 
-  onDayTap: function (e) {
-    var detail = e.detail
-    var dateStr = detail.year + '-' +
-      (detail.month < 10 ? '0' : '') + detail.month + '-' +
-      (detail.day < 10 ? '0' : '') + detail.day
+  onDayTap(e) {
+    const { year, month, day } = e.detail
+    const dateStr = `${year}-${String(month).padStart(2, '0')}-${String(day).padStart(2, '0')}`
 
-    var allRecords = []
-    var all = storage.getRecords()
-    Object.keys(all).forEach(function (key) {
-      allRecords = allRecords.concat(all[key])
-    })
-
-    var sessions = allRecords.filter(function (r) { return r.date === dateStr })
-    var totalDur = 0
-    sessions.forEach(function (r) { totalDur += r.duration })
-    var calories = Math.round(totalDur * 0.068)
+    const allRecords = Object.values(storage.getRecords()).flat()
+    const sessions = allRecords.filter(r => r.date === dateStr)
+    const totalDur = sessions.reduce((sum, r) => sum + r.duration, 0)
+    const calories = Math.round(totalDur * 0.068)
 
     this.setData({
       showDayDetail: true,
@@ -111,27 +96,26 @@ Page({
         sessions: sessions.length,
         duration: totalDur,
         durationText: util.formatDuration(totalDur),
-        calories: calories
+        calories
       }
     })
   },
 
-  onCloseDayDetail: function () {
+  onCloseDayDetail() {
     this.setData({ showDayDetail: false })
   },
 
-  noop: function () {},
+  noop() {},
 
-  onDeleteRecord: function (e) {
-    var id = e.currentTarget.dataset.id
-    var self = this
+  onDeleteRecord(e) {
+    const id = e.currentTarget.dataset.id
     wx.showModal({
       title: '删除记录',
       content: '确定要删除这条训练记录吗？',
-      success: function (res) {
+      success: (res) => {
         if (res.confirm) {
           storage.deleteRecord(id)
-          self.refresh()
+          this.refresh()
           wx.showToast({ title: '已删除', icon: 'none', duration: 1200 })
         }
       }