原生js实现一个计算器-html代码-BFW代码库

代码语言：html

代码描述：原生js实现一个计算器

下面为部分代码预览，完整代码请点击下载或在bfwstudio webide中打开


<!DOCTYPE html>
<html lang="en" >

<head>

  <meta charset="UTF-8">

  
  
  <link rel='stylesheet' href='https://fonts.googleapis.com/css2?family=Open+Sans:wght@600&amp;family=Press+Start+2P&amp;display=swap'>
  
<style>
html {
  width: 100%;
  height: 100%;
  padding: 0;
  margin: 0;
  display: flex;
  align-items: center;
  justify-content: center;
}

body {
  padding: 0;
  margin: 0;
  background-image: linear-gradient(to right, #bdc3c7 0%, #ecf0f1 40%, #ecf0f1 60%, #bdc3c7 100%);
}

.calculator {
  width: 250px;
  background-color: #2c3e50;
  background-image: linear-gradient(to right, #334b63 0%, #4b6580 40%, #4b6580 60%, #334b63 100%);
  border-width: 1px;
  border-style: solid;
  border-top-color: rgba(255, 255, 255, 0.6);
  border-bottom-color: black;
  border-right-color: black;
  border-left-color: black;
  border-radius: 8px;
  box-shadow: 0 0 10px rgba(0, 0, 0, 0.4), inset 0 0 3px 4px rgba(0, 0, 0, 0.5);
  border-top: 4px solid rgba(255, 255, 255, 0.2);
}

/* Screen
-------------------------------*/
.screen-wrapper {
  margin: 15px;
  padding: 3px;
  background-color: rgba(0, 0, 0, 0.3);
  box-shadow: 0 2px 2px rgba(255, 255, 255, 0.5);
  border-radius: 5px;
}

#screen {
  height: 60px;
  background-image: linear-gradient(to bottom, #ffcc00 0%, #ffde74 100%);
  border-radius: 30%/7%;
  box-shadow: inset 0 0 20px rgba(0, 0, 0, 0.6);
  padding: 8px 5px;
}

#expression {
  font-family: 'Press Start 2P', cursive;
  font-size: 12px;
  height: 20px;
  line-height: 20px;
  overflow: hidden;
  white-space: nowrap;
  display: flex;
  align-items: center;
}

#result {
  font-family: 'Press Start 2P', cursive;
  font-size: 28px;
  text-align: right;
  margin-top: 10px;
  white-space: nowrap;
}

#typed-cursor {
  border-right: 3px solid black;
  height: 14px;
  animation: 1s blink step-end infinite;
}

@keyframes blink {
  from, to {
    border-color: transparent;
  }
  50% {
    border-color: black;
  }
}
.keys {
  width: 100%;
  border-spacing: 12px;
}

.key {
  width: 25%;
  cursor: pointer;
  font-family: 'Open Sans', sans-serif;
  color: #ecf0f1;
  font-size: 18px;
  text-align: center;
  padding: 8px 0;
  border-radius: 5px;
  border-width: 3px;
  border-style: solid;
  border-top-color: rgba(255, 255, 255, 0.2);
  border-left-color: rgba(0, 0, 0, 0.1);
  border-right-color: rgba(0, 0, 0, 0.1);
  border-bottom-color: rgba(0, 0, 0, 0.3);
  box-shadow: 0 0 4px 2px rgba(0, 0, 0, 0.7);
  transition: all 0.2s ease-out;
}
.key:hover {
  border: 3px solid rgba(226, 154, 26, 0.6);
  box-shadow: 0 0 4px 2px rgba(0, 0, 0, 0.7), inset 0 0 6px rgba(0, 0, 0, 0.4);
  color: #e2aa1a;
  text-shadow: 0 0 10px #ffda99;
}
.key.red {
  background-image: linear-gradient(to bottom, #963434 0%, #be4d4d 50%, #963434 100%);
}
.key.blue {
  background-image: linear-gradient(to bottom, #2c3e50 0%, #3a5066 50%, #2c3e50 100%);
}
.key.gray {
  background-image: linear-gradient(to bottom, #6e8597 0%, #829baf 50%, #6e8597 100%);
}
.key.substract, .key.divide, .key.add, .key.eval {
  font-size: 28px;
  line-height: 18px;
}
.key.substract {
  vertical-align: top;
}
.key span {
  font-size: 10px;
  vertical-align: top;
}

.footer {
  font-family: 'Open Sans', sans-serif;
  font-size: 12px;
  text-align: center;
  color: rgba(0, 0, 0, 0.5);
  text-shadow: 0 1px 0 rgba(255, 255, 255, 0.17);
}
</style>



</head>

<body translate="no" >
  <div class="calculator">
  <div class="screen-wrapper">
    <div id="screen">
      <div id="expression"><span id="typed-cursor"/></div>
      <div id="result">0</div>
    </div>
  </div>
  <table class="keys">
    <tbody>
      <tr>
        <td class="red key" data-func="clear">C</td>
        <td class="red key" data-func="cancel_entry">CE</td>
        <td class="gray key power" data-token="op_pow">x<span>y</span></td>
        <td class="gray key divide" data-token="op_divide">&divide;</td>
      </tr>
      <tr>
        <td class="blue key" data-token="num_7">7</td>
        <td class="blue key" data-token="num_8">8</td>
        <td class="blue key" data-token="num_9">9</td>
        <td class="gray key" data-token="op_multiply">&times;</td>
      </tr>
      <tr>
        <td class="blue key" data-token="num_4">4</td>
        <td class="blue key" data-token="num_5">5</td>
        <td class="blue key" data-token="num_6">6</td>
        <td class="gray key substract" data-token="op_substract">&ndash;</td>
      </tr>
      <tr>
        <td class="blue key" data-token="num_1">1</td>
        <td class="blue key" data-token="num_2">2</td>
        <td class="blue key" data-token="num_3">3</td>
        <td class="gray key add" data-token="op_add" rowspan="2">+</td>
      </tr>
      <tr>
        <td class="blue key" data-token="num_dot">.</td>
        <td class="blue key" data-token="num_0">0</td>
        <td class="blue key eval" data-func="eval">=</td>
      </tr>
    </tbody>
  </table>
  <p class="footer">Electronic Calculator</p>
</div>

  
      <script>
// This is an old project of mine, resurrected from the dead :)
// I made this back in 2014, as I was learning about postfix
// notation at the university. This calculator uses postfix
// notation to compute the result of the expression given to it
// by the user. I kept the code as it is, so I apologize 
// if it looks a bit outdated... :)
//
// To read more about postfix notation, see https://en.wikipedia.org/wiki/Reverse_Polish_notation

window.onload = function() {
    new Calculator();
};

/**
 * Calculator class
 */
function Calculator() {
    this.op_add       = '+';
    this.op_substract = '-&.........完整代码请登录后点击上方下载按钮下载查看