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: &＃39;I am global data&＃39;})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 &＃39;Roboto&＃39;;
}.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: &＃39;0&＃39;, // 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= { &＃39;key-pide&＃39;: (prevValue, nextValue) => prevValue / nextValue, &＃39;key-multiply&＃39;: (prevValue, nextValue) => prevValue * nextValue, &＃39;key-add&＃39;: (prevValue, nextValue) => prevValue + nextValue, &＃39;key-subtract&＃39;: (prevValue, nextValue) => prevValue - nextValue, &＃39;key-equals&＃39;: (prevValue, nextValue) => nextValue
}
},
/* AC操作，一下回到解放前 */
clearAll() { this.setData({
value: null,
displayValue: &＃39;0&＃39;,
operator: null,
waitingForOperand: false
})
}, /* 仅清空当前显示的输入值 */
clearDisplay() { this.setData({
displayValue: &＃39;0&＃39;
})
},
onTapFunction: function(event) {
const key = event.target.dataset.key; switch(key) { case &＃39;key-clear&＃39;: if (this.data.displayValue !== &＃39;0&＃39;) { this.clearDisplay();
} else { this.clearAll();
} break; case &＃39;key-sign&＃39;: var newValue = parseFloat(this.data.displayValue) * -1
this.setData({
displayValue: String(newValue)
}) break; case &＃39;key-percent&＃39;:
const fixedDigits = this.data.displayValue.replace(/^-?\d*\.?/, &＃39;&＃39;) 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 == &＃39;key-dot&＃39;) { // 按下点号
if (!(/\./).test(this.data.displayValue)) { this.setData({
displayValue: this.data.displayValue + &＃39;.&＃39;,
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 === &＃39;0&＃39; ? String(digit) : this.data.displayValue + digit
})
}
}
}
})
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