HTML实现简单计算器

时间：2024-10-03 13:06:02
 <!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>

HTML实现简单计算器

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