App({  onLaunch: function() {     // Do something initial when launch.  },  onShow: function() {      // Do something when show.  },  onHide: function() {      // Do something when hide.  },  globalData: ‘I am global data‘})

{  "pages": [    "page/index/index"  ],  "window": {    "navigationBarBackgroundColor": "#000",    "backgroundColor": "#000",    "navigationBarBackgroundColor": "#000"  },  "networkTimeout": {    "request": 10000,    "connectSocket": 10000,    "uploadFile": 10000,    "downloadFile": 10000  },  "debug": true}

<template name="calculator-key">  <button hover-start-time="{{5}}" hover-stay-time="{{20}}" hover-class="calculator-key-hover" data-key="{{className}}" class="calculator-key {{className}}">{{display}}</button></template><view class="calculator">  <view class="calculator-display">    <view class="calculator-display-text">{{displayValue}}</view>  </view>  <view class="calculator-keypad">    <view class="input-keys">      <view class="function-keys" catchtap="onTapFunction">        <template is="calculator-key" data="{{className: ‘key-clear‘, display: clearDisplay ? ‘C‘ : ‘AC‘}}"/>        <template is="calculator-key" data="{{className: ‘key-sign‘, display: ‘±‘}}"/>        <template is="calculator-key" data="{{className: ‘key-percent‘, display: ‘%‘}}"/>      </view>      /*sdf*/      <view class="digit-keys" catchtap="onTapDigit">        <template is="calculator-key" data="{{className: ‘key-0‘, display: ‘0‘}}"/>        <template is="calculator-key" data="{{className: ‘key-dot‘, display: ‘●‘}}"/>        <template is="calculator-key" data="{{className: ‘key-1‘, display: ‘1‘}}"/>        <template is="calculator-key" data="{{className: ‘key-2‘, display: ‘2‘}}"/>        <template is="calculator-key" data="{{className: ‘key-3‘, display: ‘3‘}}"/>        <template is="calculator-key" data="{{className: ‘key-4‘, display: ‘4‘}}"/>        <template is="calculator-key" data="{{className: ‘key-5‘, display: ‘5‘}}"/>        <template is="calculator-key" data="{{className: ‘key-6‘, display: ‘6‘}}"/>        <template is="calculator-key" data="{{className: ‘key-7‘, display: ‘7‘}}"/>        <template is="calculator-key" data="{{className: ‘key-8‘, display: ‘8‘}}"/>        <template is="calculator-key" data="{{className: ‘key-9‘, display: ‘9‘}}"/>      </view>    </view>    <view class="operator-keys" catchtap="onTapOperator">        <template is="calculator-key" data="{{className: ‘key-divide‘, display: ‘÷‘}}"/>        <template is="calculator-key" data="{{className: ‘key-multiply‘, display: ‘ב}}"/>        <template is="calculator-key" data="{{className: ‘key-subtract‘, display: ‘−‘}}"/>        <template is="calculator-key" data="{{className: ‘key-add‘, display: ‘+‘}}"/>        <template is="calculator-key" data="{{className: ‘key-equals‘, display: ‘=‘}}"/>    </view>  </view></view>

@import "reset.wxss";page {  font: 100 14px ‘Roboto‘;}.calculator {  width: 100%;  height: 100vh;  background: black;  position: relative;  box-shadow: 0px 0px 20px 0px #aaa;  display: flex;  flex-direction: column;  box-sizing: border-box;}.calculator-display {  background: #1c191c;  flex: 1;}/*TODO:解决文本垂直居中问题*/.calculator-display-text {  padding: 0 30px;  font-size: 6em;  color: white;  text-align: right;}.calculator-keypad {  display: flex;}.calculator .function-keys {  display: flex;}.calculator .digit-keys {  background: #e0e0e7;  display: flex;  flex-direction: row;  flex-wrap: wrap-reverse;}.calculator-key-hover {  box-shadow: inset 0px 0px 25vw 0px rgba(0,0,0,0.25);}.calculator-key {  display: block;  width: 25vw;  height: 25vw;  line-height: 25vw;  border-top: 1px solid #777;  border-right: 1px solid #666;  text-align: center;  box-sizing: border-box;}.calculator .function-keys .calculator-key {  font-size: 2em;}.calculator .digit-keys .calculator-key {  font-size: 2.25em;}.calculator .digit-keys .key-0 {  width: 50vw;  text-align: left;  padding-left: 9vw;}.calculator .digit-keys .key-dot {  padding-top: 1em;  font-size: 0.75em;}.calculator .operator-keys .calculator-key {  color: white;  border-right: 0;  font-size: 3em;}.calculator .function-keys {  background: linear-gradient(to bottom, rgba(202,202,204,1) 0%, rgba(196,194,204,1) 100%);}.calculator .operator-keys {  background:  linear-gradient(to bottom, rgba(252,156,23,1) 0%, rgba(247,126,27,1) 100%);}.input-keys {  width: 75%;}.operator-keys {  width: 25%;}

Page({  data: {    value: null, // 上次计算后的结果，null表示没有上次计算的结果    displayValue: ‘0‘, // 显示数值    operator: null, // 上次计算符号，null表示没有未完成的计算    waitingForOperand: false // 前一按键是否为计算符号  },  onl oad: function(options) {    this.calculatorOperations = {      ‘key-divide‘: (prevValue, nextValue) => prevValue / nextValue,      ‘key-multiply‘: (prevValue, nextValue) => prevValue * nextValue,      ‘key-add‘: (prevValue, nextValue) => prevValue + nextValue,      ‘key-subtract‘: (prevValue, nextValue) => prevValue - nextValue,      ‘key-equals‘: (prevValue, nextValue) => nextValue    }  },    /* AC操作，一下回到解放前 */  clearAll() {    this.setData({      value: null,      displayValue: ‘0‘,      operator: null,      waitingForOperand: false    })  },  /* 仅清空当前显示的输入值 */  clearDisplay() {    this.setData({      displayValue: ‘0‘    })  },  onTapFunction: function(event) {    const key = event.target.dataset.key;    switch(key) {      case ‘key-clear‘:        if (this.data.displayValue !== ‘0‘) {          this.clearDisplay();        } else {          this.clearAll();        }        break;      case ‘key-sign‘:        var newValue = http://www.mamicode.com/parseFloat(this.data.displayValue) * -1                this.setData({          displayValue: String(newValue)        })        break;      case ‘key-percent‘:        const fixedDigits = this.data.displayValue.replace(/^-?\d*\.?/, ‘‘)        var newValue = http://www.mamicode.com/parseFloat(this.data.displayValue) / 100                this.setData({          displayValue: String(newValue.toFixed(fixedDigits.length + 2))        });        break;              default:        break;    }  },  onTapOperator: function(event) {    const nextOperator = event.target.dataset.key;    const inputValue = parseFloat(this.data.displayValue);        if (this.data.value =http://www.mamicode.com/= null) {      this.setData({        value: inputValue      });    } else if (this.data.operator) {      const currentValue = this.data.value || 0;      const newValue = this.calculatorOperations[this.data.operator](currentValue, inputValue);      this.setData({        value: newValue,        displayValue: String(newValue)      });    }        this.setData({      waitingForOperand: true,      operator: nextOperator    });  },  onTapDigit: function(event) {    const key = event.target.dataset.key; // 根据data-key标记按键    if(key == ‘key-dot‘) {      // 按下点号      if (!(/\./).test(this.data.displayValue)) {        this.setData({          displayValue: this.data.displayValue + ‘.‘,          waitingForOperand: false        })      }    } else {      // 按下数字键      const digit = key[key.length-1];      if (this.data.waitingForOperand) {        this.setData({          displayValue: String(digit),          waitingForOperand: false        })      } else {        this.setData({          displayValue: this.data.displayValue =http://www.mamicode.com/== ‘0‘ ? String(digit) : this.data.displayValue + digit        })      }    }  }})