微信小程序计算器实例详解

<view class="content">    <view class="num">{{num}}</view>    <view class="operotor">{{op}}</view></view><view class="entry">    <view>        <view class="item" bindtap="resetBtn">c</view>        <view class="item" bindtap="delBtn">DEL</view>        <view class="item" bindtap="opBtn" data-val="%">%</view>        <view class="item" bindtap="opBtn" data-val="/">÷</view>    </view>    <view>        <view class="item" bindtap="numBtn" data-val="7">7</view>        <view class="item" bindtap="numBtn" data-val="8">8</view>        <view class="item" bindtap="numBtn" data-val="9">9</view>        <view class="item" bindtap="opBtn" data-val="*">x</view>    </view>    <view>        <view class="item" bindtap="numBtn" data-val="4">4</view>        <view class="item" bindtap="numBtn" data-val="5">5</view>        <view class="item" bindtap="numBtn" data-val="6">6</view>        <view class="item" bindtap="opBtn" data-val="-">-</view>    </view>    <view>        <view class="item" bindtap="numBtn" data-val="1">1</view>        <view class="item" bindtap="numBtn" data-val="2">2</view>        <view class="item" bindtap="numBtn" data-val="3">3</view>        <view class="item" bindtap="opBtn" data-val="+">+</view>    </view>    <view>        <view class="item tow" bindtap="numBtn" data-val="0">0</view>        <view class="item one" bindtap="dotBtn" data-val=".">.</view>        <view class="item one" bindtap="opBtn" data-val="=">=</view>    </view></view>

page {  display: flex;  flex-direction: column;  height: 100%;}.content {  flex: 1;  background-color: #f3f6fe;  position: relative;}.content .num {  position: absolute;  font-size: 27pt;  bottom: 5vh;  right: 3vw;}.content .operotor {  font-size: 15pt;  position: absolute;  bottom: 1vh;  right: 3vw;}.entry {  flex: 1;  font-size: 17pt;  border-top: 1rpx solid #ccc;}.entry .item {  flex: 1;  padding: 30rpx 0;  text-align: center;  flex-basis: 25%;  border-left: 1rpx solid #ccc;  border-bottom: 1rpx solid #ccc;}.entry > view {  display: flex;}.entry > view .tow {  flex: 2;}.entry > view .one {  flex: 1;}

Page({    data: {        num: "",  // 存储数字        op: ""    //存储运算符    },    result: null,      isClear: false,    numBtn: function(e) {        var num = e.target.dataset.val            //console.log(num) 得到data-val的值        console.log(this.isClear)        if (this.data.num === "0" || this.isClear) {            this.setData({ num: num })            this.isClear = false        } else {            this.setData({ num: this.data.num + num })        }    },    opBtn: function(e) {        var op = this.data.op        var num = Number(this.data.num)        this.setData({ op: e.target.dataset.val })        if (this.isClear) {            return        }        this.isClear = true        if (this.result === null) {            this.result = num            return        }        if (op === "+") {            this.result = this.result + num        } else if (op === "-") {            this.result = this.result - num        } else if (op === "*") {            this.result = this.result * num        } else if (op === "/") {            this.result = this.result / num        } else if (op === "%") {            this.result = this.result % num        }        this.setData({ num: this.result })    },    dotBtn: function() {        if (this.isClear) {            this.setData({ num: "0." })            this.isClear = false            return        }        if (this.data.num.indexOf(".") >= 0) {            return        }        this.setData({ num: this.data.num + "." })    },    delBtn: function() {        var num = this.data.num.substr(0, this.data.num.length - 1)        this.setData({ num: num === "" ? "0" : num })    },    resetBtn: function() {        this.result = null        this.isClear = false        this.setData({ num: "0", op: "" })    }})