使用js制作计算器
<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="Generator" content="EditPlus®">
<meta name="Author" content="">
<meta name="Keywords" content="">
<meta name="Description" content="">
<title>Document</title>
<script type="text/javascript"> //相加
function add(){
var first=0;
jai=Number(document.getElementById("text").value); var scoent=0;
jia=Number(document.getElementById("text2").value); var sum=0;
sum=jai+jia;
document.getElementById("jieg").value=sum;
} //相减
function delect(){ var jian=0;
jian=jai-jia;
document.getElementById("jieg").value=jian;
} //相乘 function chen(){ var ce=0;
ce=jai*jia;
document.getElementById("jieg").value=ce;
} //相除 function chu(){ var cu=0;
cu=jai/jia;
document.getElementById("jieg").value=cu;
} </script> </head>
<body>
<table style="background:red">
<tr>
<td colspan="4" align="center">购物简易计算器</td> </tr> <tr>
<td>第一个数</td>
<td colspan="3"><input type="text" id="text"></td> </tr> <tr>
<td>第二个数</td>
<td colspan="3"><input type="text" id="text2"></td> </tr> <tr> <td><input type="submit" value="+" style="width:100% " onclick="add()"></td>
<td><input type="submit" value="—" style="width:100% " onclick="delect()"></td>
<td><input type="submit" value="X" style="width:100% " onclick="chen()"></td>
<td><input type="submit" value="/" style="width:100% " onclick="chu()"></td>
</tr> <tr>
<td>计算结果</td>
<td colspan="3"><input type="text" id="jieg" /></td> </tr> </table> </body>
</html>