小程序如何实现简单的计算器
本篇内容介绍了“小程序如何实现简单的计算器”的有关知识，在实际案例的操作过程中，不少人都会遇到这样的困境，接下来就让小编带领大家学习一下如何处理这些情况吧！希望大家仔细阅读，能够学有所成！
效果如下：
#app.json
{
"pages": [
"pages/index/index",
"pages/logs/logs"
],
"window": {
"navigationBarBackgroundColor": "#000000",
"navigationBarTextStyle": "white",
"navigationBarTitleText": "智能计算器"
},
"tabBar": {
"color": "#ff69b4",
"selectedColor": "#0000ff",
"backgroundColor": "#ffff00",
"list": [
{
"pagePath": "pages/index/index",
"text": "计 算 机"
},
{
"pagePath": "pages/logs/logs",
"text": "日志"
},
{
"pagePath": "pages/logs/logs",
"text": "回家"
}
]
}
}#app.wsxx
/**app.wxss**/
.container {
height: 100%;
display: flex;
flex-direction: column;
align-items: center;
justify-content: space-between;
padding: 200rpx 0;
box-sizing: border-box;
}#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-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 = 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
})
}
}
}
})#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 { /*显示器背景颜色*/
background: #2c2a2c;
flex: 1;
}
/*TODO:解决文本垂直居中问题,显示器数字颜色*/
.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 { /*按钮按下以后的颜色*/
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%;
}“小程序如何实现简单的计算器”的内容就介绍到这里了，感谢大家的阅读。如果想了解更多行业相关的知识可以关注蜗牛博客网站，小编将为大家输出更多高质量的实用文章！
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