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原生JS简易计算器

图片演示:

原生JS简易计算器

代码演示:

<!doctype html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>简单计算器 - NiceHan</title>
    <style type="text/css">
      * {
        border: 0;
      }

      body {
        background-color: rgba(100, 149, 237, 0.8);
      }

      h1 {
        color: white;
        text-align: center;
        font-family: "Microsoft YaHei";
        font-size: 56px;
        font-weight: bold;
        text-shadow:
          0px 0px 0 rgb(148, 148, 148),
          1px 1px 0 rgb(125, 125, 125),
          2px 2px 0 rgb(103, 103, 103),
          3px 3px 0 rgb(80, 80, 80),
          4px 4px 0 rgb(57, 57, 57),
          5px 5px 0 rgb(34, 34, 34),
          6px 6px 0 rgb(11, 11, 11),
          7px 7px 6px rgba(0, 0, 0, 0.75),
          7px 7px 1px rgba(0, 0, 0, 0.5),
          0px 0px 6px rgba(0, 0, 0, 0.2);
      }

      input {
        margin: 6px;
        background-color: white;
      }

      .btnstyle {
        background-color: orange;
      }

      input:hover {
        background-color: #c0c0c0;
      }

      input[type="button"] {
        height: 36px;
        width: 36px;
      }

      input[type="text"] {
        height: 36px;
        width: 190px;
      }
    </style>

    <script type="text/javascript">
      function num(val) {
        switch (val) {
          case "=":
            document.getElementById("texton").value = eval(document.getElementById("texton").value);
            break;

          case "AC":
            document.getElementById("texton").value = "";
            break;

          default:
            document.getElementById("texton").value = document.getElementById("texton").value + val;
            document.getElementById("texton").value = document.getElementById("texton").value;
        }
      }
    </script>
  </head>

  <body>
    <h1>简单计算器 - NiceHan</h1>

    <div style="width: 208px;margin: auto;background-color: black;">
      <input type="text" name="texton" id="texton" value="" style="text-align: center;font-size: 16px;background-color: lightyellow;" />
      <br />
      <input type="button" name="btn1" id="btnac" value="AC" onclick="num(this.value)" style="width: 141px;" />
      <input type="button" name="btn1" id="btn+" value="+" onclick="num(this.value)" class="btnstyle" />
      <br />
      <input type="button" name="btn1" id="btn1" value="1" onclick="num(this.value)" />
      <input type="button" name="btn1" id="btn2" value="2" onclick="num(this.value)" />
      <input type="button" name="btn1" id="btn3" value="3" onclick="num(this.value)" />
      <input type="button" name="btn1" id="btn-" value="-" onclick="num(this.value)" class="btnstyle" />
      <br />
      <input type="button" name="btn1" id="btn4" value="4" onclick="num(this.value)" />
      <input type="button" name="btn1" id="btn5" value="5" onclick="num(this.value)" />
      <input type="button" name="btn1" id="btn6" value="6" onclick="num(this.value)" />
      <input type="button" name="btn1" id="*" value="×" onclick="num(this.id)" class="btnstyle" />
      <br />
      <input type="button" name="btn1" id="btn7" value="7" onclick="num(this.value)" />
      <input type="button" name="btn1" id="btn8" value="8" onclick="num(this.value)" />
      <input type="button" name="btn1" id="btn9" value="9" onclick="num(this.value)" />
      <input type="button" name="btn1" id="/" value="÷" onclick="num(this.id)" class="btnstyle" />
      <br />
      <input type="button" name="btn0" id="btn0" value="0" onclick="num(this.value)" style="width: 90px;" />
      <input type="button" name="btn1" id="btn." value="." onclick="num(this.value)" />
      <input type="button" name="btn1" id="btn=" value="=" onclick="num(this.value)" class="btnstyle" />
    </div>
  </body>
</html>