本文例項為大家分享了小程式實現計算器功能的具體程式碼，供大家參考，具體內容如下

實現模擬手機上的計算器，輸入即可運算

本頁面是做一個計算收款的頁面，如果不需要下面的內容可以刪除掉

wxml

<view class="calculate-box">
  <view class="calculate-txt">{{express}}</view>
  <view class="result-num">={{result}}</view>
</view>
<view class="fixation-box">
  <view class="calculator-box">
    <view class="calculator-line">
      <view data-con='c' class='boxtn btn1 clear' catchtap="clickKeyBoard">AC</view>
      <view data-con='←' class='boxtn btn1' catchtap="clickKeyBoard">
        <image src="../../../images/clear-icon.png" class="clear-icon"></image>
      </view>
      <view data-con='100' class='boxtn btn1 percent' catchtap="clickKeyBoard">%</view>
      <view data-con='' class='boxtn num' catchtap="clickKeyBoard"></view>
    </view>
    <view class="calculator-line">
      <view data-con='7' class='boxtn btn1 num' catchtap="clickKeyBoard">7</view>
      <view data-con='8' class='boxtn btn1 num' catchtap="clickKeyBoard">8</view>
      <view data-con='9' class='boxtn btn1 num' catchtap="clickKeyBoard">9</view>
      <view data-con='' class='boxtn num' catchtap="clickKeyBoard"></view>
    </view>
    <view class="calculator-line">
      <view data-con='4' class='boxtn btn1 num' catchtap="clickKeyBoard">4</view>
      <view data-con='5' class='boxtn btn1 num' catchtap="clickKeyBoard">5</view>
      <view data-con='6' class='boxtn btn1 num' catchtap="clickKeyBoard">6</view>
      <view data-con='-' class='boxtn num' catchtap="clickKeyBoard">-</view>
    </view>
    <view class="calculator-line">
      <view data-con='1' class='boxtn btn1 num' catchtap="clickKeyBoard">1</view>
      <view data-con='2' class='boxtn btn1 num' catchtap="clickKeyBoard">2</view>
      <view data-con='3' class='boxtn btn1 num' catchtap="clickKeyBoard">3</view>
      <view data-con='+' class='boxtn num' catchtap="clickKeyBoard">+</view>
    </view>
    <view class="calculator-line">
      <view data-con='0' class='boxtn btn2 num' catchtap="clickKeyBoard">0</view>
      <view data-con='.' class='boxtn btn1 num' catchtap="clickKeyBoard">.</view>
      <view data-con='=' class='boxtn equal' catchtap="result">=</view>
    </view>
  </view>
  <view class="bottom-handle">
    <!-- <view class="sweep-code-verification" bindtap="sweepCodeVerification">
      <image src="../../../images/sweep-code-verification.png"></image>
      <text>掃碼核銷</text>
    </view> -->
    <view style="flex: 1;font-size: 34rpx;" class="artificial-collection" bindtap="artificial_collection">
      <!--<image src="../../../images/artificial-collection.png"></image> -->
      <text>人工收款</text>
    </view>
    <view class="payment-code" bindtap="qrcode_collection">收款碼收款</view>
  </view>
</view>

data: {
    express: '',//第一行的表示式
    result: '0',//第二行的結果
    calc2: {
YuqMZtBhYF      str: '',//臨時字串
      strList: [],//中綴表示式儲存（佇列先進先出）
      strListP: [],//字尾表示式（佇列先進先出）
      list: [],//存放運算子的堆疊 （先進後出）
      count: [],//計算表示式堆疊（先進後出）
      flag: 0 //表示字串最後一位是否是運算子號位
    },isqr: false,},//給所有text或view繫結此事件，同時增加對應的自定義屬性值
  clickKeyBoard(e) {
    let that = this;
    let input = e.currentTarget.dataset.con //獲取每次輸入的內容
    if (input == "c") {
      that.handleClear();
    } else if (input == "←") {
      that.handleDelete();
    } else {
      //呼叫處理字串
      that.handleInfo(input);

    }


  },//處理本地使用者的輸入操作
  handleInfo(input) {
    if (this.data.calc2.str.length == 0) { //第一次點選
      if (input == "-" || this.checkShuZi(input)) { //為減號
        this.addStr(input);
      } else {
        return;
      }
    } else {
      if (this.data.calc2.flag == 1) { //說明最後一位是符號
        if (this.checkFuHao(input)) {
          this.data.calc2.str = this.data.calc2.str.substring(0,this.data.calc2.str.length - 1); //去掉最後一位符號，新增最新的符號進去
          this.addStr(input);
        } else {
          this.addStr(input);
        }
        console.log();
      } else {
        this.addStr(input);
        this.result();
      }
    }
    this.result();
  },//客戶點選等號了
  result() {
    //每次點選等號重新把列表給空
    this.data.calc2.strList.length = 0;
    this.data.calc2.strListP.length = 0;
    this.data.cYuqMZtBhYF
 
alc2.list.length = 0;
    this.data.calc2.count.length = 0;

    //將表示式變成中綴表示式佇列
    this.expressToStrList(this.data.express);
    console.log(this.data.calc2.strList);

    //將中綴表示式集合賦值給臨時變數
    let tempList = this.data.calc2.strList;
    this.expressToStrListP(tempList);
    console.log(this.data.calc2.strListP);

    //最終的計算
    let tempP = this.data.calc2.strListP
    for (let m in tempP) {
      if (this.checkFuHao2(tempP[m])) { //不含點號的符號方法判斷
        let m1 = this.data.calc2.count[0]; //取出第一個資料
        this.data.calc2.count.shift(); //取出後刪除該資料
        let m2 = this.data.calc2.count[0];
        this.data.calc2.count.shift();
        // console.log('m1是' +m1);
        // console.log('m2是' + m2);
        // console.log('運算子是' + tempP[m]);
        // console.log('計算結果是：' + this.countDetail(m2,tempP[m],m1));
        this.data.calc2.count.unshift(this.countDetail(m2,m1)); //將計算結果放到count中
      } else {
        this.data.calc2.count.unshift(tempP[m]) //將數字壓進去
      }
    }
    console.log('最終的計算結果是' + parseFloat(this.data.calc2.count[0]).toFixed(2));
    this.setData({
      result: this.data.calc2.count[0]
    });
  },//實際具體計算
  countDetail(e1,e2,e3) {
    let result = 0.0;
    console.log(e1);
    console.log(e2);
    console.log(e3);
    try {
      if (e2 == "") {
        if (typeof(e1) != "undefined") {
          result = parseFloat(e1) * parseFloat(e3);
        } else {
          result = parseFloat(e3);
        }
      } else if (e2 == "") {
        if (typeof(e1) != "undefined") {
          result = parseFloat(e1) / parseFloat(e3);
        } else {
          result = parseFloat(e3);
        }
      } else if (e2 == "%") {
        if (typeof(e1) != "undefined") {
          result = parseFloat(e1) / parseFloat(e3);
        } else {
          result = parseFloat(e3);
        }
      } else if (e2 == "+") {
        if (typeof(e1) != "undefined") {
          result = parseFloat(e1) + parseFloat(e3);
        } else {
          result = parseFloat(e3);
        }
      } else {
        if (typeof (e1) != "undefined") {
          result = parseFloat(e1) - parseFloat(e3);
        } else {
          result = parseFloat(e3);
        }
      }
    } catch (error) {

    }
    return result;
  },//將中綴表示式集合轉變為字尾表示式集合
  expressToStrListP(tempList) {
    for (let item in tempList) {
      if (this.checkFuHao2(tempList[item])) { //不含點號的符號方法判斷
        ihttp://www.cppcns.com
 
f (this.data.calc2.list.length == 0) {
          this.data.calc2.list.unshift(tempList[item]); //直接新增新增運算子
        } else {
          if (this.checkFuHaoDX(this.data.calc2.list[0],tempList[item])) {
            for (let x in this.data.calc2.list) {
              this.data.calc2.strListP.push(this.data.calc2.list[x]); //將運算子都放到listP中
            }
            this.data.calc2.list.length = 0; //迴圈完把list置空
            this.data.calc2.list.unshift(tempList[item]); //加新元素進去
          } else {
            this.data.calc2.list.unshift(tempList[item]); //直接新增新增運算子
          }
        }
      } else {
        this.data.calc2.strListP.push(tempList[item]); //數字直接加到字尾集合中
      }
    }
    //迴圈完有可能最後一個是數字了，取到的不是字元，那麼運算子裡剩餘的還的加到listP中
    if (this.data.calc2.list.length > 0) {
      for (let x in this.data.calc2.list) {
        this.data.calc2.strListP.push(this.data.calc2.list[x]); //將運算子都放到listP中
      }
      this.data.calc2.list.length = 0; //迴圈完把list置空
    }
  },//判斷兩個運算子的優先順序(m1是list集合中最後加進去的那個元素比較將要進來的元素，如果m1比m2大，彈出list集合到listp中，再把m2加到list中，否則直接將m2加入list)
  checkFuHaoDX(m1,m2) {
    if ((m1 == "%" || m1 == "" || m1 == "") && (m2 == "-" || m2 == "+")) {
      return true;
    } else {
      return false;
    }
  },//將字串表示式變成中綴佇列
  expressToStrList(express) {
    let temp = ''; //定義臨時變數
    //將表示式改為中綴佇列
    for (let i = 0; i < express.length; i++) {
      if (i == 0 && express[i] == "-") {
        temp = temp + express[i];
      } else {
        if (this.checkShuZi2(express[i])) { //如果i是數字
          temp = temp + express[i];
        } else {
          if (temp.length > 0) {
            if (express[i] == ".") {
              temp = temp + express[i];
            } else {
              this.data.calc2.strList.push(parseFloat(temp));
              temp = '';
              this.data.calc2.strList.push(express[i]);
            }
          } else {
            temp = temp + express[i];
          }
        }
      }
    }
    //迴圈到最後再看temp中有沒有數字了，如果有加進來
    if (temp.length > 0 && this.checkShuZi(temp.substring(temp.length - 1))) {
      this.data.calc2.strList.push(parseFloat(temp));
      temp = '';
    }
  },//處理客戶輸入清除鍵
  handleClear() {
    this.data.calc2.str = '';
    this.data.calc2.strList.length = 0;
    this.data.calc2.strListP.length = 0;
    this.data.calc2.list.length = 0;
    this.data.calc2.count.length = 0;
    this.data.calc2.minusFlag = 0;
    this.setData({
      express: '',result: ''
    });
  },//處理客戶輸入回退鍵
  handleDelete() {
    let that = this;
    let str = that.data.calc2.str;
    if (str.length > 0) {
      str = str.substring(0,str.length - 1);
      that.data.calc2.str = str;
      that.setData({
        express: str,});
    } else {
      return;
    }
  },//判斷是否是運算子（含點號，用在組織表示式時 .不能重複輸入）
  checkFuHao(input) {
    if (input == "-" || input == "+" || input == "" || input == "%" || input == "" || input == ".") {
      return true;
    } else {
      return false;
    }
  },//判斷是否是運算子（不含點號）
  checkFuHao2(input) {
    if (input == "-" || input == "+" || input == "" || input == "%" || input == "") {
      return true;
    } else {
      return false;
    }
  },//判斷是否是數字
  checkShuZi(input) {
    if (input == "0" || input == "1" || input == "2" ||
      input == "3" || input == "4" || input == "5" ||
      input == "6" || input == "7" || input == "8" || input == "9") {
      return true;
    } else {
      return false;
    }
  },//判斷是否是數字(包含.號，用在表示式轉中綴方法中)
  checkShuZi2(input) {
    if (input == "0" || input == "1" || input == "2" ||
      input == "3" || input == "4" || input == "5" ||
      input == "6" || input == "7" || input == "8" || input == "9" || input == ".") {
      return true;
    } else {
      return false;
    }
  },//給字串新增新字元(直接追加 在判斷是否要改變變數flag)
  addStr(input) {
    this.data.calc2.str = this.data.calc2.str + input;
    if (this.checkFuHao(input)) {
      this.data.calc2.flag = 1; //設定標記位位1
    } else {
      this.data.calc2.flag = 0;
    }
    this.setData({
      express: this.data.calc2.str
    });
  },

wxss

/* pages/index/collect-money/collect-money.wxss */

page {
  background-color: #f8f8f8;
}

.bottom-handle {
  height: 100rpx;
  width: 100%;
  display: flex;
  align-items: center;
}

.fixation-box {
  position: fixed;
  bottom: 0;
  width: 750rpx;
}

.sweep-code-verification {
  background: #fff;
  border-top: 1rpx solid #e3e3e3;
  width: 220rpx;
  color: #333;
}

.artificial-collection,.sweep-code-verification {
  height: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  font-size: 24rpx;
  justify-content: center;
}

.artificial-collection {
  background: #f3b055;
  width: 248rpx;
  color: #fff;
}

.payment-code {
  background-image: linear-gradient(203deg,#6f6f6f 0%,#3c3c3c 96%);
  flex: 1;
  font-size: 34rpx;
  color: #fff;
  text-align: center;
  line-height: 100rpx;
}

.sweep-code-verification image {
  width: 40rpx;
  height: 40rpx;
}

.artificial-collection image {
  width: 40rpx;
  height: 40rpx;
}

.calculator-box {
  background-color: #fff;
}

.calculator-line {
  display: flex;
  align-items: center;
}

.boxtn {
  width: 25%;
  height: 154rpx;
  border-left: none;
  display: flex;
  align-items: center;
  justify-content: center;
}

.calculator-box .calculator-line:last-child {
  border-bottom: none;
}

.calculator-line {
  border-bottom: 1rpx solid #dedede;
}

.btn1,.btn2 {
  border-right: 1rpx solid #dedede;
}

.btn2 {
  width: 50%;
}

.equal {
  background: #f3b055;
  font-size: 61rpx;
  color: #fff;
}

.num {
  font-size: 60rpx;
  color: #000;
}

.clear {
  font-size: 48rpx;
  color: #f3b055;
}

.percent {
  font-size: 60rpx;
  color: #000;
}

.charge-content {
  background: #fff;
  border-radius: 24rpx;
  width: 540rpx;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.charge-title {
  background: #f3b055;
  border-radius: 12px 12px 0 0;
  width: 100%;
  height: 92rpx;
  font-size: 34rpx;
  line-height: 92rpx;
  text-align: center;
  color: #fff;
}

.charge-money {
  font-size: 60rpx;
  color: #333;
  line-height: 84rpx;
  margin-top: 35rpx;
}

.charge-propmt {
  font-size: 28rpx;
  color: #999;
  line-height: 42rpx;
  padding-bottom: 40rpx;
}

.charge-btn {
  display: flex;
  align-items: center;
  height: 100rpx;
  border-top: 1rpx solid #ddd;
  width: 100%;
}

.charge-cancel,.charge-confirm {
  flex: 1;
  text-align: center;
  line-height: 100rpx;
  font-size: 34rpx;
}

.charge-cancel {
  color: #999;
  border-right: 1rpx solid #ddd;
}

.charge-confirm {
  color: #f3b055;
}

.successful-content {
  background: #fff;
  border-radius: 24rpx;
  width: 540rpx;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.success-icon {
  width: 120rpx;
  margin-top: 45rpx;
  height: 120rpx;
}

.successful-title {
  font-size: 34rpx;
  color: #333;
  line-height: 42rpx;
  padding: 30rpx 0;
  font-weight: 600;
}

.clear-icon {
  width: 80rpx;
  height: 80rpx;
}

.calculate-box {
  position: fixed;
  top: 0;
  bottom: 875rpx;
  width: 100%;
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  padding: 0 50rpx;
}

.result-num {
  font-size: 88rpx;
  color: #333;
  line-height: 124rpx;
}

.calculate-txt {
  font-size: 60rpx;
  color: #333;
  line-height: 84rpx;
  margin-top: auto;
  word-wrap: break-word;
  text-align: right;
  word-break: break-all;
  text-overflow: -o-ellipsis-lastline;
  overflow: hidden;
  text-overflow: ellipsis;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
}
.suspend-box{
  height: 64rpx;
  background-color: rgba(0,.5);
  position: fixed;
  top: 70rpx;
  left: 0;
  color: #fff;
  display: flex;
  align-items: center;
  font-size: 24rpx;
  padding: 0 20rpx;
  border-radius: 0 100rpx 100rpx 0;
  z-index: 9;
}
.close-suspend{
  width: 30rpx;
  height: 30rpx;
}

以上就是本文的全部內容，希望對大家的學習有所幫助，也希望大家多多支援我們。