双恒 使用 HTML、CSS 和 JavaScript 创建一个简单的计算器
学生成绩计算器用于获取所有科目的成绩输入，然后根据学生的分数计算百分比。该计算器返回相当可靠的学生成绩指标。
计算成绩的简单公式是：
$\text{Percentage}= \frac{\text{得分}}{\text{总分}}\times 100$
我们将使用 HTML 进行输入，输入后我们将调用 JS 函数计算这些数字的平均百分比并将其返回给用户。
创建计算器的步骤 -
我们将使用输入标签从用户处获取输入。
获取输入后，我们会将这些输入传递给 JS 中的计算函数。
计算函数基本上会聚合结果并返回结果
获得结果后，HTML 将向用户显示结果。
示例
在下面的示例中，我们将创建一个简单的成绩计算器，它将接受成绩输入并查找每个学生的汇总成绩百分比。
index.html
<!DOCTYPE html>
<html>
<head>
<title>Student Grade Calculator</title>
<!-- link for font -->
<link href= https://fonts.googleapis.com/css family=Righteous&display=swaprel=stylesheet/>
<link rel=stylesheet href=styles.css />
</head>
<body>
<!-- main html -->
<h1 style=color: green>
Welcome To Tutorials Point
</h1>
<div class=container>
<h2>Student grade calculator:</h2>
<div class=screen-body-item>
<div class=app>
<div class=form-group>
<!-- option for taking the input -->
Enter Student's marks in Chemistry:
<input
type=text
class=form-control
placeholder=CHEMISTRY
id=chemistry />
</div>
<div class=form-group>
Enter Student's marks in Maths:
<input
type=text
class=form-control
placeholder=MATHS
id=maths />
</div>
<div class=form-group>
Enter Student's marks in Physics:
<input
type=text
class=form-control
placeholder=PHYSICS
id=phy />
</div>
<div>
<input
type=button
value=show Percentage
class=form-button
onclick=calculate() />
</div>
</div>
</div>
<!-- for showing the result-->
<div class=form-group showdata>
<p id=showdata></p>
</div>
</div>
<!--adding external javascript file-->
<script src=script.js></script>
</body>
</html>styles.css
.container {
flex: 0 1 700px;
margin: auto;
padding: 10px;
}
.screen-body-item {
flex: 1;
padding: 50px;
}
input {
m argin: 10px 10px 10px;
}
.showdata {
color: black;
font-size: 1.2rem;
padding-top: 10px;
padding-bottom: 10px;
}
#form-group {
padding: 20px;
}script.js
// Function for calculating grades
const calculate = () => {
// Getting input from user into height variable.
let chemistry = document.querySelector(#chemistry).value;
let maths = document.querySelector(#maths).value;
let phy = document.querySelector(#phy).value;
let grades = ;
// Input is string so typecasting is necessary. */
let totalgrades =
parseFloat(chemistry) +
parseFloat(maths) +
parseFloat(phy);
// Checking the condition for the providing the
// grade to student based on percentage
let percentage = (totalgrades / 300) * 100;
if (percentage <= 100 && percentage >= 80) {
grades = A;
} else if (percentage <= 79 && percentage >= 60) {
grades = B;
} else if (percentage <= 59 && percentage >= 40) {
grades = C;
} else {
grades = F;
}
// Checking the values are empty if empty than
// show please fill them
if (chemistry == || maths == || phy == ) { document.querySelector(#showdata).innerHTML = Please enter all the fields;
} else {
// Checking the condition for the fail and pass
if (percentage >= 39.5) {
document.querySelector(
#showdata
).innerHTML =
` Out of 300 your total is ${totalgrades}
and percentage is ${percentage}%. <br>
Your grade is ${grades}. You are Pass. `;
} else {
document.querySelector(
#showdata
).innerHTML =
` Out of 300 your total is ${totalgrades}
and percentage is ${percentage}%. <br>
Your grade is ${grades}. You are Fail. `;
}
}
};输出
输入标记并单击“显示百分比”时 -
我们合并了 HTML、CSS 和 JS，以帮助您在此处检查该程序的输出。
单击以下链接查看该程序的现场演示：
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