微信小程序计算器代码

以下是微信小程序简易计算器的代码，包括wxml、js和json文件：

wxml文件：

<view class="container">
  <view class="result">{{result}}</view>
  <view class="row">
    <view class="btn" bindtap="inputNumber" data-num="7">7</view>
    <view class="btn" bindtap="inputNumber" data-num="8">8</view>
    <view class="btn" bindtap="inputNumber" data-num="9">9</view>
    <view class="btn" bindtap="operator" data-op="+">+</view>
  </view>
  <view class="row">
    <view class="btn" bindtap="inputNumber" data-num="4">4</view>
    <view class="btn" bindtap="inputNumber" data-num="5">5</view>
    <view class="btn" bindtap="inputNumber" data-num="6">6</view>
    <view class="btn" bindtap="operator" data-op="-">-</view>
  </view>
  <view class="row">
    <view class="btn" bindtap="inputNumber" data-num="1">1</view>
    <view class="btn" bindtap="inputNumber" data-num="2">2</view>
    <view class="btn" bindtap="inputNumber" data-num="3">3</view>
    <view class="btn" bindtap="operator" data-op="*">*</view>
  </view>
  <view class="row">
    <view class="btn" bindtap="inputNumber" data-num="0">0</view>
    <view class="btn" bindtap="clear">C</view>
    <view class="btn" bindtap="calculate">=</view>
    <view class="btn" bindtap="operator" data-op="/">/</view>
  </view>
</view>

js文件：

Page({
  data: {
    result: '0',
    num1: '',
    num2: '',
    operator: ''
  },
  inputNumber: function(e) {
    var num = e.currentTarget.dataset.num;
    if (this.data.operator === '') {
      this.setData({
        num1: this.data.num1 + num,
        result: this.data.num1 + num
      });
    } else {
      this.setData({
        num2: this.data.num2 + num,
        result: this.data.num1 + this.data.operator + this.data.num2 + num
      });    }
  },
  operator: function(e) {
    var op = e.currentTarget.dataset.op;
    if (op === '+' || op === '-' || op === '*' || op === '/') {
      this.setData({
        operator: op,
        result: this.data.result + op
      });
    }
  },
  clear: function() {
    this.setData({
      result: '0',
      num1: '',
      num2: '',
      operator: ''
    });
  },
  calculate: function() {
    var num1 = parseFloat(this.data.num1);
    var num2 = parseFloat(this.data.num2);
    var operator = this.data.operator;
    var result;
    switch (operator) {
      case '+':
        result = num1 + num2;
        break;
      case '-':
        result = num1 - num2;
        break;
      case '*':
        result = num1 * num2;
        break;
      case '/':
        result = num1 / num2;
        break;
      default:
        break;
    }
    this.setData({
      result: result.toString(),
      num1: result.toString(),
      num2: '',
      operator: ''
    });
  }
})

json文件：

{
  "navigationBarBackgroundColor": "#fff",
  "navigationBarTitleText": "计算器",
  "navigationBarTextStyle": "black"
}