本文主要分为两个部分,小程序主体部分及计算器业务页面部分
一个小程序主体部分由三个文件组成,必须放在项目的根目录,如下:
1. 小程序逻辑
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'})
2. 小程序公共设置
{ "pages": [ "page/index/index" ], "window": { "navigationBarBackgroundColor": "#000", "backgroundColor": "#000", "navigationBarBackgroundColor": "#000" }, "networkTimeout": { "request": 10000, "connectSocket": 10000, "uploadFile": 10000, "downloadFile": 10000 }, "debug": true }
计算器页面主要由以下文件组成。
1. 计算器页面结构
页面结构分为2个主要部分:显示区和键盘区
其中键盘区又分功能键、数字键,及运算键,页面结构如下
{{displayValue}} /*sdf*/
2. 计算器样式表
样式代码如下所示
@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%; }
3、 计算器页面逻辑处理
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 }, onLoad: function(options) { this.calculatorOperatiOns= { 'key-pide': (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 = parseFloat(this.data.displayValue) * -1 this.setData({ displayValue: String(newValue) }) break; case 'key-percent': const fixedDigits = this.data.displayValue.replace(/^-?\d*\.?/, '') var newValue = 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 == 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 === '0' ? String(digit) : this.data.displayValue + digit }) } } } })