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HTML calculator with detailed ideas
- 高洛峰Original
- 2017-02-28 13:29:581503browse
The general idea is to store the key content in the text box in the form of a string. When the button is "=", call the eval method to calculate the result and then output the result into the text box. Friends who need it can refer to the following
The code is as follows:
<!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="pision"
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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