js 计算器

来源：互联网发布：蝙蝠算法编辑：程序博客网时间：2024/06/05 03:37
<!DOCTYPE html><html><meta name="content-type" content="text/html; charset=UTF-8"><head>    <title>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('+')"                   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>
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