js html实现计算器功能

2019-11-19 12:31:34

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本文实例为大家分享了html实现计算器功能的具体代码，供大家参考，具体内容如下

代码：

<!DOCTYPE html><html><head>  <meta charset="utf-8" />  <title></title>  <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('+')"            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('-')"            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('*')"            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('.')"            style="height: 70px; width: 90px; font-size: 35px">      </td>      <td>        <input type="button" value="/" id="division"            onclick="onclicknum('/')"            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>

效果图