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<template>
<div id="app">
<div class="calculator" style="margin-top:0px;margin-bottom:0px;">
<div class="results input">{{equation}}</div>
<div class="mode">
<button type="button" class="button" @click="append(7)">7</button>
<button type="button" class="button" @click="append(8)">8</button>
<button type="button" class="button" @click="append(9)">9</button>
<button type="button" class="button" @click="append('×')">*</button>
<button type="button" class="button" @click="clear">AC</button>
<button type="button" class="button" @click="append(4)">4</button>
<button type="button" class="button" @click="append(5)">5</button>
<button type="button" class="button" @click="append(6)">6</button>
<button type="button" class="button" @click="append('÷')">/</button>
<button type="button" class="button" @click="calculatePercent">%</button>
<button type="button" class="button" @click="append(1)">1</button>
<button type="button" class="button" @click="append(2)">2</button>
<button type="button" class="button" @click="append(3)">3</button>
<button type="button" class="button" @click="append('+')">+</button>
<button type="button" class="button" @click="append('-')">-</button>
<button type="button" class="button" @click="append(0)">0</button>
<button type="button" class="button" @click="append('.')">.</button>
<button type="button" class="button" @click="calculateToggle">±</button>
<button type="button" class="button calculate" @click="calculate">=</button>
<!-- <button class="button" @click="press">(</button>
<button class="button" @click="press">)</button>-->
<!-- <button class="button" @click="press">x 2</button> -->
</div>
</div>
</div>
</template>
<script>
export default {
data() {
return {
equation: "0",
isDecimalAdded: false, //只能输入一个小数位
isOperatorAdded: false, //只能写一个等号
isStarted: false //判断是否已经开始输入数据
};
},
methods: {
//判断是否是增删改查
isOperator(character) {
return ["+", "-", "×", "÷"].indexOf(character) > -1;
},
//追加数字
append(character) {
if (this.equation === "0" && !this.isOperator(character)) {
if (character === ".") {
this.equation += "" + character;
this.isDecimalAdded = true;
} else {
this.equation = "" + character;
}
this.isStarted = true;
return;
}
if (!this.isOperator(character)) {
if (character === "." && this.isDecimalAdded) {
return;
}
if (character === ".") {
this.isDecimalAdded = true;
this.isOperatorAdded = true;
} else {
this.isOperatorAdded = false;
}
this.equation += "" + character;
}
if (this.isOperator(character) && !this.isOperatorAdded) {
this.equation += "" + character;
this.isDecimalAdded = false;
this.isOperatorAdded = false;
}
},
//点击等于号
calculate() {
let result = this.equation
.replace(new RegExp("×", "g"), "*")
.replace(new RegExp("÷", "g"), "/");
this.equation = parseFloat(eval(result).toFixed(9)).toString();
this.isDecimalAdded = false;
this.isOperatorAdded = false;
},
//点击AC
clear() {
this.equation = "0";
this.isDecimalAdded = false;
this.isOperatorAdded = false;
this.isStarted = false;
},
//点击正负号
calculateToggle() {
if (this.isOperatorAdded || !this.isStarted) {
true;
}
this.equation = this.equation + "*(-1))";
this.calculate();
},
//点击百分比
calculatePercent() {
if (this.isOperatorAdded || !this.isStarted) {
true;
}
this.equation = this.equation + "*0.01";
this.calculate();
}
}
};
</script>
<style scoped>
.calculator {
width: 500px;
padding: 20px;
border-radius: 5px;
margin: 20px auto;
font-size: 16px;
background-color: #d9d9d9;
}
.button {
margin: 3px;
width:80px;
border: 1px solid #0d0d0d;
height: 30px;
border-radius: 4px;
columns: #d9d9d9;
background-color: white;
cursor: pointer;
outline: none;
}
.calculate {
width: 175px;
}
.mode {
display: flex;
flex-wrap: wrap;
justify-content: space-evenly;
}
.input {
width: 480px;
height: 50px;
border-radius: 0px;
border: 1px solid black;
background-color: white;
color: black;
padding: 0 5px 0 5px;
margin: 0 0px 10px 0px;
}
</style>