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HTML实现简单计算器附详细思路

不言

May 07, 2018 pm 06:00 PM

html 计算器详细

大概思路就是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,需要的朋友可以参考下

复制代码

代码如下:

<!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(&#39;+&#39;)" 
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(&#39;-&#39;)" 
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(&#39;*&#39;)" 
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(&#39;.&#39;)" 
style="height: 70px; width: 90px; font-size: 35px"> 
</td> 
<td> 
<input type="button" value="/" id="pision" 
onclick="onclicknum(&#39;/&#39;)" 
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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