如何在HTML和Javascript中实现基本计算器
[英]How to implement basic calculator in HTML & Javascript
问题描述
我正在尝试编写一个html代码以将两个或多个数字相加，相减，相除或相乘，但是遇到了困难...（我尝试添加一些CSS只是为了使其看起来不错，但我更担心代码先运行）。 我也在使用Javascript。 请问我做错了什么？
<html>
<head>
<body bgcolor="FFFCC">
<table border="0" cellpadding="0"
cellspacing="1" sytyle ="border-collapse. collapse"
bordercolor="#1111" width ="50%">
<hi><p align="center">CALCULATOR</p></hi><br>
<script language= "javascript">
function ADD()
{
var first=parsefloat(txtNumber1.value);
var second=parsefloat(txtNumber2.value);
var Ans =first+second;
txtAnswer.value=Ans;
}
function MINUS()
{
var first=parsefloat(txtNumber1.value);
var second=parsefloat(txtNumber2.value);
var Ans =first-second;
txtAnswer.value=Ans;
function DIVIDE()
{
var first=parsefloat(txtNumber1.value);
var second=parsefloat(txtNumber2.value);
var Ans =first/second;
txtAnswer.value=Ans;
}
function MULTIPLY()
{
var first=parsefloat(txtNumber1.value);
var second=parsefloat(txtNumber2.value);
var Ans =first*second;
txtAnswer.value=Ans;
}
function MODULO()
{
var first=parsefloat(txtNumber1.value);
var second=parsefloat(txtNumber2.value);
var Ans =first%second;
txtAnswer.value=Ans;
}
</script>
</head>
<input type ="text" name="txtNumber1"/><br>
<input type ="text" name="txtNumber2"/><br>
<input type ="button" name="butAnswer"
value="+" onclick="ADD()"/>
<input type ="button" name="butAnswer"
value="-" onclick="MINUS()"/>
<input type ="button" name="butAnswer"
value="/" onclick="DIVIDE()"/>
<input type ="button" name="butAnswer"
value="*" onclick="MULTIPLY()"/>
<input type ="button" name="butAnswer"
value="%" onclick="MODULO()"/><br>
<input type ="text" name="txtAnswer"/>
</table>
</body>
</html>
3 个解决方案
解决方案1
1 2017-11-18 11:07:43
尝试更正这些行：
var first=parsefloat(document.getElementsByName("txtNumber1")[0].value);
var second=parsefloat(document.getElementsByName("txtNumber2")[0].value);
document.getElementsByName("txtAnswer")[0].value=Ans;
解决方案2
1 2017-11-18 11:08:51
您未引用输入元素！
在这个例子中
var first=parsefloat(txtNumber1.value);
txtNumber1未定义
这会起作用
var first=parsefloat(document.getElementsByName(txtNumber1)[0].value);
解决方案3
1 2017-11-18 12:02:37
<html>
<head>
</head>
<body bgcolor="FFFCC">
<table width="50%" align="center">
<tr><td colspan="2"><hi><p>CALCULATOR</p></hi></td></tr>
<tr><td><input type ="text" id="txtNumber1" placeholder="Enter first number"/><input type ="text" id="txtNumber2" placeholder="Enter second number"/> <input type ="text" id="txtAnswer"/></td>
<tr><td><input type ="button" name="butAnswer"
value="+" onclick="ADD()"/>
<input type ="button" name="butAnswer"
value="-" onclick="MINUS()"/>
<input type ="button" name="butAnswer"
value="/" onclick="DIVIDE()"/>
<input type ="button" name="butAnswer"
value="*" onclick="MULTIPLY()"/>
<input type ="button" name="butAnswer"
value="%" onclick="MODULO()"/></td></tr>
<tr>
</table>
<script language= "javascript">
var answer=document.getElementById("txtAnswer")
function ADD()
{
var number1=document.getElementById("txtNumber1")
var number2=document.getElementById("txtNumber2")
number1=parseFloat(number1.value)
number2=parseFloat(number2.value)
var Ans =number1+number2;
answer.value=Ans;
}
function MINUS()
{
var number1=document.getElementById("txtNumber1")
var number2=document.getElementById("txtNumber2")
number1=parseFloat(number1.value)
number2=parseFloat(number2.value)
var Ans =number1-number2;
answer.value=Ans;
}
function DIVIDE()
{
var number1=document.getElementById("txtNumber1")
var number2=document.getElementById("txtNumber2")
number1=parseFloat(number1.value)
number2=parseFloat(number2.value)
var Ans =number1/number2;
answer.value=Ans;
}
function MULTIPLY()
{
var number1=document.getElementById("txtNumber1")
var number2=document.getElementById("txtNumber2")
number1=parseFloat(number1.value)
number2=parseFloat(number2.value)
var Ans =number1*number2;
answer.value=Ans;
}
function MODULO()
{
var number1=document.getElementById("txtNumber1")
var number2=document.getElementById("txtNumber2")
number1=parseFloat(number1.value)
number2=parseFloat(number2.value)
var Ans =number1%number2;
answer.value=Ans;
}
</script>
</body>
</html>
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