微信小程序（一）计算器_rpn.js

源码下载：https://download.csdn.net/download/qq_29914837/11189315

一、功能效果图预览

二、实现案例

1.目录结构

2. app.json文件

{
  "pages": [
    "pages/calculator/calculator",
    "pages/index/index",
    "pages/history/history",
    "pages/logs/logs"
  ],
  "window": {
    "backgroundTextStyle": "light",
    "navigationBarBackgroundColor": "#fff",
    "navigationBarTitleText": "计算器",
    "navigationBarTextStyle": "black"
  },
  "sitemapLocation": "sitemap.json"
}
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3 app.wxss文件

/**app.wxss**/
.container {
  height: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: space-between;
  padding: 200rpx 0;
  box-sizing: border-box;
} 

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4 calculator.js文件

var rpn = require("../../utils/rpn.js");
Page({

  /**
   * 页面的初始数据
   */
  data: {
    idb: "back",
    idc: "clear",
    idadd: "+",
    id9: "9",
    id8: "8",
    id7: "7",
    idj: "-",
    id6: "6",
    id5: "5",
    id4: "4",
    idx: "×",
    id3: "3",
    id2: "2",
    id1: "1",
    iddiv: "÷",
    id0: "0",
    idd: ".",
    ide: "＝",
    screenData: "0",
    operaSymbo: {
      "+": "+",
      "-": "-",
      "×": "*",
      "÷": "/",
      ".": "."
    },
    iconType: 'waiting_circle',
    iconColor: 'white',
    logs: []
  },

  /**
   * 生命周期函数--监听页面加载
   */
  onLoad: function(options) {

  },

  /**
   * 生命周期函数--监听页面初次渲染完成
   */
  onReady: function() {

  },

  /**
   * 生命周期函数--监听页面显示
   */
  onShow: function() {

  },

  /**
   * 生命周期函数--监听页面隐藏
   */
  onHide: function() {

  },

  /**
   * 生命周期函数--监听页面卸载
   */
  onUnload: function() {

  },

  /**
   * 页面相关事件处理函数--监听用户下拉动作
   */
  onPullDownRefresh: function() {

  },

  /**
   * 页面上拉触底事件的处理函数
   */
  onReachBottom: function() {

  },

  /**
   * 用户点击右上角分享
   */
  onShareAppMessage: function() {

  },

  clickBtn: function(event) {
    var id = event.target.id;

    if (id == this.data.idc) { //idc:"clear"  选择 C 清屏
      this.setData({
        "screenData": "0"
      }); //选择 C 显示 0
    } else if (id == this.data.idb) { //idb:"back" 选择←
      var data = this.data.screenData; //获取显示框内容
      if (data == "0") { //显示框数据为0是，默认展示0
        data = "0";
      } else {
        data = data.substring(0, data.length - 1); //获取显示框 前n-1数据
        if (data.length == 0) { //数据只有0位时，默认展示0
          data = "0";
        }
      }
      this.setData({
        "screenData": data
      });

    } else if (id == this.data.ide) { //ide:"=" 选择=
      var data = this.data.screenData; //获取显示框内容
      var lastWord = data.charAt(data.length - 1);//获取最后一个字符
      if (data == 0 || isNaN(lastWord)) { //判断显示框为0或最后一个字符是否是数值类型不做处理
        return;
      }
      var result =  rpn.calCommonExp(data)+"";//调用rpn.js方法，微信小程序不支持eval函数
      if (result.indexOf(".")>=0) {
        var length = result.split(".")[1].length; //小数点后面字符串
        if (length > 10) {
          result = Number(result).toFixed(10)+"";
        }
      }  
      this.setData({
        "screenData": result
      }); 

      //存储历史记录
      this.data.logs.push(data +"="+ result);
      wx.setStorageSync("calclogs", this.data.logs); 
      
    } else if (this.data.operaSymbo[id]) { // operaSymbo:＋ - *  /  .
      var data = this.data.screenData; //获取显示框内容
      var a = data.length;
     
      if (!this.data.operaSymbo[data.charAt(data.length - 1)]) { //判断最后一个字符是否包含在operaSymbo中，存在即不能追加
        data = data + id;
      }
      this.setData({
        "screenData": data
      });
    } else { //选择0到9的值
      var data = this.data.screenData;
      if (data == "0") {
        data = id;
      } else {
        data = data + id;
      }
      this.setData({
        "screenData": data
      });

    }

  },

history: function () {
    wx.navigateTo({
      url: '../history/history'
    })
  }
})
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5 calculator.wxml文件

<view class="main-view">

<view class="content">
    <view class="screen">
      {{screenData}}  
  </view>
</view>

<view class="layout-bottom">
  <view class="btnGroup">
    <view class="item black" bindtap="clickBtn" id="{{idc}}">С</view>
    <view class="item black" bindtap="clickBtn" id="{{idb}}">←</view>
    <view class="item black iconBtn" bindtap="history">
      <icon type="{{iconType}}" color="{{iconColor}}" class="icon" size="25" />
    </view>
    <view class="item red" bindtap="clickBtn" id="{{idadd}}">+</view>
  </view>

  <view class="btnGroup">
    <view class="item black" bindtap="clickBtn" id="{{id7}}">7</view>
    <view class="item black" bindtap="clickBtn" id="{{id8}}">8</view>
    <view class="item black" bindtap="clickBtn" id="{{id9}}">9</view>
    <view class="item red" bindtap="clickBtn" id="{{idj}}">－</view>
  </view>
  <view class="btnGroup">
    <view class="item black" bindtap="clickBtn" id="{{id4}}">4</view>
    <view class="item black" bindtap="clickBtn" id="{{id5}}">5</view>
    <view class="item black" bindtap="clickBtn" id="{{id6}}">6</view>
    <view class="item red" bindtap="clickBtn" id="{{idx}}">×</view>
  </view>
  <view class="btnGroup">
    <view class="item black" bindtap="clickBtn" id="{{id1}}">1</view>
    <view class="item black" bindtap="clickBtn" id="{{id2}}">2</view>
    <view class="item black" bindtap="clickBtn" id="{{id3}}">3</view>
    <view class="item red" bindtap="clickBtn" id="{{iddiv}}">÷</view>
  </view>
  <view class="btnGroup">
    <view class="item black zero" bindtap="clickBtn" id="{{id0}}">0</view>
    <view class="item black" bindtap="clickBtn" id="{{idd}}">.</view>
    <view class="item red" bindtap="clickBtn" id="{{ide}}">＝</view>
  </view>
</view>
</view>
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6 calculator.wxss文件

.main-view {
 height: 100%;
 width: 100%;
 
}
.content {
    height: 250rpx;
    flex-direction: column;
    align-items: center;
    background-color: rgb(0, 0, 0);
    font-family: "Microsoft YaHei";
    overflow-x: hidden;
    position:relative;
}
 .screen {   
   text-align: right;  
    margin-top: 180rpx;
    margin-right: 20rpx;
    font-weight: bold;
    font-size: 50rpx;
    color: #fff;
    word-wrap:break-word; overflow:hidden; 
}

.layout-bottom{
    width: 100%;
    height:  calc(100% - 250rpx);
}

.btnGroup {
    display: flex;
    flex-direction: row;
    flex: 1;
    width: 100%;
    height: 5rem;
    background-color: #fff;
}
.item {
    width:25%;
    display: flex;
    align-items: center;
    flex-direction: column;
    justify-content: center;
    margin-top: 1px;
    margin-right: 1px;
    border-color: #838485;
}
.item:active {
    background-color: #424040;
}
.zero{
    width: 50%;
}
.orange {
    color: #fef4e9;
    background: #f78d1d;
    font-weight: bold;
}
.red {
    color:#d9eef7;
    background-color: #f80606;
}
.black {
  color: #fff;
  background-color: #838485;
border-style:solid;
border-color: #050505;
border: 0rpx;

}
.iconBtn{
    display: flex;
}
.icon{
   display: flex;
   align-items: center;
   width:100%;
   justify-content: center;
}
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7 history.js文件

// pages/history/history.js
Page({

  /**
   * 页面的初始数据
   */
  data: {

  },

  /**
   * 生命周期函数--监听页面加载
   */
  onLoad: function (options) {
    // 页面初始化 options为页面跳转所带来的参数
    var logs = wx.getStorageSync('calclogs');
    this.setData({ "logs": logs });
  },

  /**
   * 生命周期函数--监听页面初次渲染完成
   */
  onReady: function () {

  },

  /**
   * 生命周期函数--监听页面显示
   */
  onShow: function () {

  },

  /**
   * 生命周期函数--监听页面隐藏
   */
  onHide: function () {

  },

  /**
   * 生命周期函数--监听页面卸载
   */
  onUnload: function () {

  },

  /**
   * 页面相关事件处理函数--监听用户下拉动作
   */
  onPullDownRefresh: function () {

  },

  /**
   * 页面上拉触底事件的处理函数
   */
  onReachBottom: function () {

  },

  /**
   * 用户点击右上角分享
   */
  onShareAppMessage: function () {

  }
})
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8 history.wxml文件

<view class="content">
        <block wx:for="{{logs}}" wx:for-item="log">
            <view class="item">{{log}}</view>
        </block>
</view>
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