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/timer/timer.js

@@ -1,7 +1,7 @@
-var Timer = require('../../utils/timer')
-var storage = require('../../utils/storage')
-var planMod = require('../../utils/plan')
-var themeMod = require('../../utils/theme')
+const Timer = require('../../utils/timer')
+const storage = require('../../utils/storage')
+const planMod = require('../../utils/plan')
+const themeMod = require('../../utils/theme')
 
 Page({
   data: {
@@ -19,26 +19,21 @@ Page({
     isFreeMode: false
   },
 
-  onLoad: function (options) {
+  onLoad(options) {
     themeMod.applyThemeToPage(this)
 
-    var target
-    var planDay = 1
-    var isFreeMode = false
+    let target
+    let planDay = 1
+    let isFreeMode = false
 
     if (options && options.free) {
       target = parseInt(options.free) || 60
       isFreeMode = true
     } else {
-      var settings = storage.getSettings()
-      var records = []
-      var allRecords = storage.getRecords()
-      Object.keys(allRecords).forEach(function (key) {
-        records = records.concat(allRecords[key])
-      })
-
-      var plan = planMod.getPlan(settings.planId)
-      planDay = planMod.getPlanDay(settings.planId, records)
+      const settings = storage.getSettings()
+      const allRecords = Object.values(storage.getRecords()).flat()
+      const plan = planMod.getPlan(settings.planId)
+      planDay = planMod.getPlanDay(settings.planId, allRecords)
       target = planMod.getTodayTarget(settings.planId, Math.min(planDay, plan.totalDays))
     }
 
@@ -47,19 +42,18 @@ Page({
       remaining: target,
       todayTarget: target,
       planDay: isFreeMode ? 0 : Math.min(planDay, 99),
-      isFreeMode: isFreeMode
+      isFreeMode
     })
 
-    var self = this
     this._timer = new Timer({
-      onTick: function (tick) {
-        self.setData({
+      onTick: (tick) => {
+        this.setData({
           remaining: tick.remaining > 0 ? tick.remaining : 0,
-          overtime: tick.remaining <= 0 ? tick.elapsed - self.data.duration : 0
+          overtime: tick.remaining <= 0 ? tick.elapsed - this.data.duration : 0
         })
       },
-      onComplete: function () {
-        self.setData({ status: 'completed', isCompleted: true })
+      onComplete: () => {
+        this.setData({ status: 'completed', isCompleted: true })
         if (storage.getSettings().vibrate) {
           try { wx.vibrateLong() } catch (e) {}
         }
@@ -68,11 +62,11 @@ Page({
     })
   },
 
-  onUnload: function () {
+  onUnload() {
     if (this._timer) this._timer.stop()
   },
 
-  onStart: function () {
+  onStart() {
     if (this.data.isPaused) {
       this._timer.resume()
       this.setData({ isRunning: true, isPaused: false, status: 'running' })
@@ -83,26 +77,25 @@ Page({
     this.setData({ isRunning: true, status: 'running' })
   },
 
-  onPause: function () {
+  onPause() {
     if (!this.data.isRunning || this.data.isPaused) return
     this._timer.pause()
     this.setData({ isPaused: true, status: 'paused' })
   },
 
-  onStop: function () {
-    var self = this
+  onStop() {
     wx.showModal({
       title: '结束训练',
       content: '确定要结束本次训练吗?',
-      success: function (res) {
-        if (res.confirm) self.finishTraining()
+      success: (res) => {
+        if (res.confirm) this.finishTraining()
       }
     })
   },
 
-  finishTraining: function () {
-    var elapsed = this._timer.stop()
-    var today = storage.getToday()
+  finishTraining() {
+    const elapsed = this._timer.stop()
+    const today = storage.getToday()
     storage.saveRecord({
       date: today,
       duration: elapsed,
@@ -111,7 +104,7 @@ Page({
     })
     storage.updateStreak(today)
 
-    wx.showToast({ title: '已记录 ' + elapsed + '秒', icon: 'none', duration: 1500 })
-    setTimeout(function () { wx.navigateBack() }, 1500)
+    wx.showToast({ title: `已记录 ${elapsed}秒`, icon: 'none', duration: 1500 })
+    setTimeout(() => { wx.navigateBack() }, 1500)
   }
 })