CodePen Embed - Kalkulator Ilmiah Lengkap

<!DOCTYPE html>
<html lang="en" >
<head>
  <meta charset="UTF-8">
  <title>Membuat Scientific Calculator dan Standard Calculator dalam Satu Aplikasi</title>
  <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/normalize/5.0.0/normalize.min.css">
<link rel="stylesheet" href="style.css">
<script src="https://cdnjs.cloudflare.com/ajax/libs/prefixfree/1.0.7/prefixfree.min.js"></script>

</head>
<body>
<marquee scrollamount="10"><h1>UANGLOCKER KALKULATOR STANDAR & KALKULATOR ILMIAH</h1></marquee>
<div id="app">
  <div class="calculator">
    <button @click="changeModeEvent" class="toggle-button">
      <p v-if="changeMode">Scientific Calculator &nbsp; &nbsp; ⚈</p>
      <p v-else>Standart Calculator &nbsp; &nbsp; ⚆</p>
    </button>
    <div class="results">
      <input class="input" v-model="current" />
    </div>
    <div class="mode" v-if="changeMode">
      <button class="button" @click="press">7</button>
      <button class="button" @click="press">8</button>
      <button class="button" @click="press">9</button>
      <button class="button" @click="press">*</button>
      <button class="button" @click="press"><=</button>
      <button class="button" @click="press">C</button>
      <button class="button" @click="press">4</button>
      <button class="button" @click="press($event)">5</button>
      <button class="button" @click="press">6</button>
      <button class="button" @click="press">/</button>
      <button class="button" @click="press">(</button>
      <button class="button" @click="press">)</button>
      <button class="button" @click="press">1</button>
      <button class="button" @click="press">2</button>
      <button class="button" @click="press">3</button>
      <button class="button" @click="press">-</button>
      <button class="button" @click="press">x ²</button>
      <button class="button" @click="press">±</button>
      <button class="button" @click="press">0</button>
      <button class="button" @click="press">.</button>
      <button class="button" @click="press">%</button>
      <button class="button" @click="press">+</button>
      <button class="button equal-sign" @click="press">=</button>
    </div>
    <div class="mode" v-else>
      <button class="button" @click="press">sin</button>
      <button class="button" @click="press">cos</button>
      <button class="button" @click="press">tan</button>
      <button class="button" @click="press">x^</button>
      <button class="button" @click="press"><=</button>
      <button class="button" @click="press">C</button>
      <button class="button" @click="press">log</button>
      <button class="button" @click="press">ln</button>
      <button class="button" @click="press">e</button>
      <button class="button" @click="press">∘</button>
      <button class="button" @click="press">rad</button>
      <button class="button" @click="press">√</button>
      <button class="button" @click="press">7</button>
      <button class="button" @click="press">8   </button>
      <button class="button" @click="press">9</button>
      <button class="button" @click="press">/</button>
      <button class="button" @click="press">x ²</button>
      <button class="button" @click="press">x !</button>
      <button class="button" @click="press">4</button>
      <button class="button" @click="press">5</button>
      <button class="button" @click="press">6</button>
      <button class="button" @click="press">*</button>
      <button class="button" @click="press">(</button>
      <button class="button" @click="press">)</button>
      <button class="button" @click="press">1</button>
      <button class="button" @click="press">2</button>
      <button class="button" @click="press">3</button>
      <button class="button" @click="press">-</button>
      <button class="button" @click="press">%</button>
      <button class="button" @click="press">±</button>
      <button class="button" @click="press">0</button>
      <button class="button" @click="press">.</button>
      <button class="button" @click="press">π</button>
      <button class="button" @click="press">+</button>
      <button class="button equal-sign" @click="press">=</button>
    </div>
  </div>
</div>
<blockquote>KLIK Scientific Calculator untuk Menggunakan Kalkulator Pangkat DLL.</blockquote>
<!-- partial -->
  <script src='https://cdnjs.cloudflare.com/ajax/libs/vue/2.3.4/vue.min.js'></script><script  src="script.js"></script>

</body>
</html>

body {
  background: #dcdcdc;
}

#app {
  font-family: 'Avenir', Helvetica, Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-align: center;
  color: #2c3e50;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-item: center;
}

.calculator {
  width: 440px;
  padding: 20px;
  border-radius: 5px;
  margin: 20px auto;
  font-size: 16px;
  background-color: #333333;
}

.input {
  width: 420px;
  height: 50px;
  border-radius: 0px;
  border: 1px solid black;
  background-color: #333333;
  color: #d9d9d9;
  padding: 0 5px 0 5px;
  margin: 0 0px 10px 0px;
  font-size: 30px;
}

.input:focus,
.input:active {
  border-color: #03a9f4;
  box-shadow: 0 0 4px #03A9F4;
  outline: none 0;
}

.button {
  margin: 3px;
  width: 63px;
  border: 1px solid #0d0d0d;
  height: 30px;
  border-radius: 4px;
  color: #d9d9d9;
  background-color: #1a1a1a;
  cursor: pointer;
  outline: none;
}

.mode {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-evenly;
}

.equal-sign {
  background-color: red;
  width: 133px;
}

.toggle-button {
  border: none;
  background-color: #333333;
  cursor: pointer;
  outline: none;
  font-size: 1rem;
  color: #fff;
  text-shadow: -1px -1px 0 rgba(0, 0, 0, 0.35);
}

p {
  margin-top: 0;
}

button::-moz-focus-inner {
  border-color: transparent;
}

let app = new Vue({
  el: '#app',
  data() {
    return {
      current: '',
      changeMode: true };
  },
  methods: {
    press: function (event) {
      let me = this;
      let key = event.target.textContent;
      if (
      key != '=' &&
      key != 'C' &&
      key != '*' &&
      key != '/' &&
      key != '√' &&
      key != "x ²" &&
      key != "%" &&
      key != "<=" &&
      key != "±" &&
      key != "sin" &&
      key != "cos" &&
      key != "tan" &&
      key != "log" &&
      key != "ln" &&
      key != "x^" &&
      key != "x !" &&
      key != "π" &&
      key != "e" &&
      key != "rad" &&
      key != "∘")
      {
        me.current += key;
      } else if (key === '=') {
        if (me.current.indexOf('^') > -1) {
          let base = me.current.slice(0, me.current.indexOf('^'));
          let exponent = me.current.slice(me.current.indexOf('^') + 1);
          me.current = eval('Math.pow(' + base + ',' + exponent + ')');
        } else {
          me.current = eval(me.current);
        }
      } else if (key === 'C') {
        me.current = '';
      } else if (key === '*') {
        me.current += '*';
      } else if (key === '/') {
        me.current += '/';
      } else if (key === '+') {
        me.current += '+';
      } else if (key === '-') {
        me.current += '-';
      } else if (key === '±') {
        if (me.current.charAt(0) === '-') {
          me.current = me.current.slice(1);
        } else {
          me.current = '-' + me.current;
        }
      } else if (key === '<=') {
        me.current = me.current.substring(0, me.current.length - 1);
      } else if (key === '%') {
        me.current = me.current / 100;
      } else if (key === 'π') {
        me.current = me.current * Math.PI;
      } else if (key === 'x ²') {
        me.current = eval(me.current * me.current);
      } else if (key === '√') {
        me.current = Math.sqrt(me.current);
      } else if (key === 'sin') {
        me.current = Math.sin(me.current);
      } else if (key === 'cos') {
        me.current = Math.cos(me.current);
      } else if (key === 'tan') {
        me.current = Math.tan(me.current);
      } else if (key === 'log') {
        me.current = Math.log10(me.current);
      } else if (key === 'ln') {
        me.current = Math.log(me.current);
      } else if (key === 'x^') {
        me.current += '^';
      } else if (key === 'x !') {
        let number = 1;
        if (me.current === 0) {
          me.current = '1';
        } else if (me.current < 0) {
          me.current = NaN;
        } else {
          let number = 1;
          for (let i = me.current; i > 0; i--) {
            number *= i;
          }
          me.current = number;
        }
      } else if (key === 'e') {
        me.current = Math.exp(me.current);
      } else if (key === 'rad') {
        me.current = me.current * (Math.PI / 180);
      } else if (key === '∘') {
        me.current = me.current * (180 / Math.PI);
      }
    },
    changeModeEvent: function () {
      let me = this;
      me.changeMode = !me.changeMode;
    } } });

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