js implements simple four arithmetic operations calculator function-JS Tutorial-php.cn

js implements simple four arithmetic operations calculator function

小云云

Release： 2018-01-30 13:34:38

Original

3859 people have browsed it

This article mainly introduces the simple four arithmetic operation calculator function implemented by JS, involving javascript event response and numerical operation related operation skills. Friends in need can refer to it. I hope it can help everyone.

Let’s take a look at the running effect first:

The specific code is as follows:

<!DOCTYPE html>
<html>
<meta name="content-type" content="text/html; charset=UTF-8">
<head>
  <title>www.jb51.net 计算器 Calculator</title>
  <!--将按键内容以字符串形式存储在文字框中当按钮为“=”时，调用eval方法计算结果然后将结果输出文字框中-->
  <script type="text/javascript">
    var numresult;
    var str;
    function onclicknum(nums) {
      str = document.getElementById("nummessege");
      str.value = str.value + nums;
    }
    function onclickclear() {
      str = document.getElementById("nummessege");
      str.value = "";
    }
    function onclickresult() {
      str = document.getElementById("nummessege");
      numresult = eval(str.value);
      str.value = numresult;
    }
  </script>
</head>
<body bgcolor="affff" >
<!--定义按键表格,每个按键对应一个事件触发-->
<table border="1" align="center" bgColor="#bbff77"
    style="height: 350px; width: 270px">
  <tr>
    <td colspan="4">
      <input type="text" id="nummessege"
          style="height: 90px; width: 350px; font-size: 50px" />
    </td>
  </tr>
  <tr>
    <td>
      <input type="button" value="1" id="1" onclick="onclicknum(1)"
          style="height: 70px; width: 90px; font-size: 35px">
    </td>
    <td>
      <input type="button" value="2" id="2" onclick="onclicknum(2)"
          style="height: 70px; width: 90px; font-size: 35px">
    </td>
    <td>
      <input type="button" value="3" id="3" onclick="onclicknum(3)"
          style="height: 70px; width: 90px; font-size: 35px">
    </td>
    <td>
      <input type="button" value="+" id="add" onclick="onclicknum(&#39;+&#39;)"
          style="height: 70px; width: 90px; font-size: 35px">
    </td>
  </tr>
  <tr>
    <td>
      <input type="button" value="4" id="4" onclick="onclicknum(4)"
          style="height: 70px; width: 90px; font-size: 35px">
    </td>
    <td>
      <input type="button" value="5" id="5" onclick="onclicknum(5)"
          style="height: 70px; width: 90px; font-size: 35px">
    </td>
    <td>
      <input type="button" value="6" id="6" onclick="onclicknum(6)"
          style="height: 70px; width: 90px; font-size: 35px">
    </td>
    <td>
      <input type="button" value="-" id="sub" onclick="onclicknum(&#39;-&#39;)"
          style="height: 70px; width: 90px; font-size: 35px">
    </td>
  </tr>
  <tr>
    <td>
      <input type="button" value="7" id="7" onclick="onclicknum(7)"
          style="height: 70px; width: 90px; font-size: 35px">
    </td>
    <td>
      <input type="button" value="8" id="8" onclick="onclicknum(8)"
          style="height: 70px; width: 90px; font-size: 35px">
    </td>
    <td>
      <input type="button" value="9" id="9" onclick="onclicknum(9)"
          style="height: 70px; width: 90px; font-size: 35px">
    </td>
    <td>
      <input type="button" value="*" id="mul" onclick="onclicknum(&#39;*&#39;)"
          style="height: 70px; width: 90px; font-size: 35px">
    </td>
  </tr>
  <tr>
    <td colspan="2">
      <input type="button" value="0" id="0" onclick="onclicknum(0)"
          style="height: 70px; width: 190px; font-size: 35px">
    </td>
    <td>
      <input type="button" value="." id="point" onclick="onclicknum(&#39;.&#39;)"
          style="height: 70px; width: 90px; font-size: 35px">
    </td>
    <td>
      <input type="button" value="/" id="pision"
          onclick="onclicknum(&#39;/&#39;)"
          style="height: 70px; width: 90px; font-size: 35px">
    </td>
  </tr>
  <tr>
    <td colspan="2">
      <input type="button" value="Del" id="clear"
          onclick="onclickclear()"
          style="height: 70px; width: 190px; font-size: 35px" />
    </td>
    <td colspan="2">
      <input type="button" value="=" id="result"
          onclick="onclickresult()"
          style="height: 70px; width: 190px; font-size: 35px" />
    </td>
  </tr>
</table>
</body>
</html>

Copy after login

Related recommendations :

Implementation of the simple four arithmetic operations calculator function in PHP

In-depth analysis of the four arithmetic operations

Calculating four arithmetic expressions using PHP

The above is the detailed content of js implements simple four arithmetic operations calculator function. For more information, please follow other related articles on the PHP Chinese website!