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這篇文章主要介紹微信小程序如何實(shí)現(xiàn)計(jì)算器小功能,文中介紹的非常詳細(xì),具有一定的參考價(jià)值,感興趣的小伙伴們一定要看完!
微信小程序現(xiàn)在越來越火爆了,我也看到很多在校大學(xué)生都在自學(xué)了,那些專門從事APP開發(fā),網(wǎng)頁開發(fā)的工作者更是看到了小程序的前景,在小程序領(lǐng)域也摻上一腳,本人也是自學(xué)小程序的,初期跟很多人一樣,遇到一些不懂的想問問別人,到貼吧去,一大堆廣告,根本沒人幫忙解決問題。
先上效果圖,這是我入門時(shí)候自己做的一款計(jì)算器,很簡(jiǎn)單,邏輯也很單一,只是我們身邊最常見的計(jì)算器的邏輯,我覺得從這個(gè)demo我更深刻學(xué)習(xí)到了wxss頁面的布局知識(shí)
代碼附上:
app.json
{ "pages":[ "pages/index/index", "pages/logs/logs" ], "window": { "navigationBarBackgroundColor": "#000000", "navigationBarTextStyle": "white", "navigationBarTitleText": "智能計(jì)算器" }, "tabBar": { //補(bǔ)充說一下,我這個(gè)tabBar是用來設(shè)置底部tab的 "color":"#ff69b4", "selectedColor":"#0000ff", "backgroundColor":"#ffff00", "list": [ { "pagePath": "pages/index/index", "text": "計(jì) 算 機(jī)" }, { "pagePath": "pages/logs/logs", "text": "日志" }, { "pagePath":"pages/logs/logs", "text":"回家" } ] } }
/*app.wxss/*
.container { height: 100%; display: flex; flex-direction: column; align-items: center; justify-content: space-between; padding: 200rpx 0; box-sizing: border-box; }
**其中一些組件不認(rèn)識(shí)的話, 建議到微信小程序官網(wǎng)多看幾遍
index.wxml:
<template name="calculator-key"> <button hover-start-time="{{5}}" hover-stay-time="{{100}}" 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' : 'C'}}"/> <template is="calculator-key" data="{{className: 'key-sign', display: '+/-'}}"/> <template is="calculator-key" data="{{className: 'key-percent', display: '%'}}"/> </view> <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: '×'}}"/> <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>
index.js:
Page({ data: { value: null, // 上次計(jì)算后的結(jié)果,null表示沒有上次計(jì)算的結(jié)果 displayValue: '0', // 顯示數(shù)值 operator: null, // 上次計(jì)算符號(hào),null表示沒有未完成的計(jì)算 waitingForOperand: false // 前一按鍵是否為計(jì)算符號(hào) }, onLoad: 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 }) }, /* 僅清空當(dāng)前顯示的輸入值 */ 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; // 根據(jù)data-key標(biāo)記按鍵 if (key == 'key-dot') { // 按下點(diǎn)號(hào) if (!(/\./).test(this.data.displayValue)) { this.setData({ displayValue: this.data.displayValue + '.', waitingForOperand: false }) } } else { // 按下數(shù)字鍵 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 }) } } } })
index.wxss:
page { height:100%; } .calculator { width: 100%; height: 100vh; border:solid 1px; background: rgb(238, 5, 5); position: relative; box-shadow: 0px 0px 20px 0px rgb(211, 41, 41); display: flex; flex-direction: column; box-sizing: border-box; } .calculator-display { /*顯示器背景顏色*/ background: #2c2a2c; flex: 1; } /*TODO:解決文本垂直居中問題,顯示器數(shù)字顏色*/ .calculator-display-text { padding: 0 30px; font-size: 3em; color: rgb(245, 245, 248); text-align: right; } .calculator-keypad { display: flex; } .calculator .function-keys { display: flex; color:rgb(245, 13, 13); } .calculator .digit-keys { background: #0808f7; display: flex; flex-direction: row; flex-wrap: wrap-reverse; } .calculator-key-hover { /*按鈕按下以后的顏色*/ box-shadow: inset 0px 0px 25vw 0px hsla(71, 90%, 48%, 0.898); } .calculator-key { background-color:aqua; display: block; width: 25vw; height: 25vw; line-height: 25vw; border-top: 1px solid rgb(6, 245, 78); border-right: 1px solid rgb(19, 241, 12); text-align: center; box-sizing: border-box; } .calculator .function-keys .calculator-key { font-size: 2em; } .calculator .digit-keys .calculator-key { font-size: 3em; } .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: rgb(248, 165, 10); border-right: 0; font-size: 3em; } .calculator .function-keys { background: linear-gradient(to bottom, rgb(6, 6, 240) 0%, rgb(52, 5, 240) 100%); } .calculator .operator-keys { background: linear-gradient(to bottom, rgba(252,156,23,1) 0%, rgba(247,126,27,1) 100%); } .input-keys { width: 100%; } .operator-keys { width: 100%; }
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