Vue 实现近似于windows自带的简单计算器

<template>
  <div class="container">
    <div class="calculator">
      <!-- 显示器 -->
      <div class="display">
        <div class="showPanel">
          <input
            class="inputArea"
            type="text"
            disabled
            readonly
            v-model="inputValue"
          />
          <input
            class="showArea"
            type="text"
            placeholder="0"
            disabled
            readonly
            v-model="resultValue"
          />
        </div>
      </div>
      <!-- 按键面板 -->
      <div class="keyPanel">
        <div class="panelArea">
          <button @click="clearValue">AC</button>
          <button @click="negation">+ \ -</button>
          <button @click="del">←</button>
          <button @click="multiply">*</button>
        </div>
        <div class="panelArea">
          <button @click="getValue('1')">1</button>
          <button @click="getValue('2')">2</button>
          <button @click="getValue('3')">3</button>
          <button @click="divide">/</button>
        </div>
        <div class="panelArea">
          <button @click="getValue('4')">4</button>
          <button @click="getValue('5')">5</button>
          <button @click="getValue('6')">6</button>
          <button @click="increment">+</button>
        </div>
        <div class="panelArea">
          <button @click="getValue('7')">7</button>
          <button @click="getValue('8')">8</button>
          <button @click="getValue('9')">9</button>
          <button @click="decrement">-</button>
        </div>
        <div class="panelArea">
          <button @click="getValue('0')" style="width: 195px">0</button>
          <button @click="getValue('.')">.</button>
          <button @click="equal">=</button>
        </div>
      </div>
    </div>
  </div>
</template>

<script>
export default {
  name: "Calculator",
  data() {
    return {
      inputValue: "", // 计算输入
      resultValue: "", // 计算结果
      firstValue: "",
      secondValue: "",
      isAddOperation: false,
      isHaveSecondValue: false,
    };
  },
  methods: {
    // 点击按键获取值
    getValue(value) {
      if (this.isAddOperation) {
        this.secondValue += value;
        this.resultValue = this.secondValue;
        this.isHaveSecondValue = true;
      } else {
        this.resultValue += value;
        this.firstValue = this.resultValue;
        this.inputValue = this.firstValue;
      }
    },

    // AC --- 清空
    clearValue() {
      this.inputValue = "";
      this.resultValue = "";
    },

    // ← --- 回退
    del() {
      this.inputValue = this.inputValue.slice(0, this.inputValue.length - 1);
      this.resultValue = this.inputValue;
    },

    // 取反
    negation() {
      if (this.isAddOperation) {
        if (this.secondValue !== "") {
          this.secondValue = this.secondValue * -1;
          this.resultValue = this.secondValue;
        } else {
          return;
        }
      } else {
        this.resultValue = this.resultValue * -1;
        this.inputValue = this.resultValue;
      }
    },

    // + - * / = 运算按键
    increment() {
      if (this.isAddOperation) {
        if (this.secondValue !== "") {
          this.equal();
          this.inputValue = this.resultValue + "+";
          // this.isAddOperation = true;
        } else {
          return;
        }
      } else if (this.firstValue == "") {
        return;
      } else {
        this.inputValue = this.inputValue + "+";
        this.isAddOperation = true;
      }
    },

    decrement() {
      if (this.isAddOperation) {
        if (this.secondValue !== "") {
          this.equal();
          this.inputValue = this.resultValue + "-";
          // this.isAddOperation = true;
        } else {
          return;
        }
      } else if (this.firstValue == "") {
        return;
      } else {
        this.inputValue = this.inputValue + "-";
        this.isAddOperation = true;
      }
    },

    multiply() {
      if (this.isAddOperation) {
        if (this.secondValue !== "") {
          this.equal();
          this.inputValue = this.resultValue + "*";
          // this.isAddOperation = true;
        } else {
          return;
        }
      } else if (this.firstValue == "") {
        return;
      } else {
        this.inputValue = this.inputValue + "*";
        this.isAddOperation = true;
      }
    },

    divide() {
      if (this.isAddOperation) {
        if (this.secondValue !== "") {
          this.equal();
          this.inputValue = this.resultValue + "/";
          // this.isAddOperation = true;
        } else {
          return;
        }
      } else if (this.firstValue == "") {
        return;
      } else {
        this.inputValue = this.inputValue + "/";
        this.isAddOperation = true;
      }
    },

    equal() {
      let result = eval(this.inputValue + this.secondValue);
      console.log(typeof result);
      if (String(result).indexOf(".") > -1) {
        this.resultValue = result.toFixed(5);
      } else {
        this.resultValue = result;
      }
      this.secondValue = "";
      // this.isAddOperation = false
    },
  },
};
</script>

<style scoped>
.container {
  padding: 15px;
}

.calculator {
  width: 450px;
  height: 685px;
  box-sizing: border-box;
  background-color: #2474b5;
  border-radius: 10px;
  padding: 10px 0px;
  -webkit-box-shadow: 5px 5px 5px;
  -moz-box-shadow: 5px 5px 5px;
  box-shadow: 5px 5px 5px;
}

.display {
  width: 90%;
  height: 145px;
  background-color: #8abcd1;
  margin: 0 auto;
  padding: 6px;
  box-sizing: border-box;
  border: 1px solid #fff;
  border-radius: 5px;
}

.showPanel {
  width: 98.5%;
  height: 130px;
  background-color: #eef7f2;
  margin: 0px auto;
  box-sizing: border-box;
  display: flex;
  flex-direction: column;
  align-items: center;
}
.inputArea {
  display: block;
  width: 94.5%;
  height: 60px;
  background-color: #eef7f2;
  border: none;
  font-size: 18px;
  text-align: right;
}
.showArea {
  display: block;
  width: 94.5%;
  height: 60px;
  margin-top: 0;
  background-color: #eef7f2;
  border: none;
  font-family: Arial, Helvetica, sans-serif;
  font-size: 36px;
  text-align: right;
}

.keyPanel {
  width: 90%;
  height: 500px;
  background-color: #8abcd1;
  box-sizing: border-box;
  border: 1px solid #fff;
  border-radius: 5px;
  margin: 10px auto;
}

.panelArea {
  width: 100%;
  height: 98px;
  display: flex;
  justify-content: space-around;
  align-items: center;
  background-color: #8abcd1;
  margin-top: 1.5px;
  border-radius: 5px;
}

button {
  display: block;
  width: 95px;
  height: 95px;
  font-size: 28px;
  font-weight: bolder;
}
</style>

效果