使用 Express.js 的身体质量指数计算器
体重指数(身体质量指数)用个体的体重和身高来表示。分别以公斤和米为单位，是体重与身高的平方之比。
BMI = (weight of body) / (height of body)2
Unit of weight: Kilogram(Kg);
Unit of height: Meter(m);
Unit of BMI is kg/m2
进场:
- 首先，我们编写 HTML 代码来创建一个表单，在这个表单中，我们将从用户那里获得姓名、身高(m)、体重(kg)作为输入。
- 导入所需模块并将其存储到应用程序变量中
- 发送 html 并使用此 在特定路线上发布数据
app.post("/bmicalculator", function (req, res) {
heigh = parseFloat(req.body.Height);
weigh = parseFloat(req.body.Weight);
bmi = weigh / (heigh * heigh);
- 使用公式检查身体质量指数条件。
第一步:
超文本标记语言
<!DOCTYPE html>
<html lang="en">
<head>
<!-- title is used to provide
a specific name to our web-page! -->
<title>BMI-CALCULATOR</title>
<!-- link function is used here, so that we can
connect our css file with our html file externally -->
<link rel="stylesheet" href="1.css" />
</head>
<body>
<div id="MAIN">
<h1 id="heading">BMI-CALCULATOR</h1>
</div>
<form action="/bmicalculator" method="post">
<input type="text"
name="Name"
placeholder="Enter your name!" />
<br />
<input id="Height"
name="Height"
placeholder="Enter your height(m)" />
<br />
<input id="Weight"
name="Weight"
placeholder="Enter your weight(kg)" />
<br />
<button class="btn"
type="submit">Get-BMI</button>
</form>
</body>
</html>
输出:
单形
现在让我们为我们的计算和功能编写代码，这是我们的身体质量指数计算器的主要部分。
第 2 步
Dependencies:
express: npm install express
bodyparser: npm install body-parser
java 描述语言
//importing modules
const express = require("express");
const bodyparser = require("body-parser");
// stores the express module into the app variable!
const app = express();
app.use(bodyparser.urlencoded({ extended: true }));
//sends index.html
app.get("/bmicalculator", function (req, res) {
res.sendFile(__dirname + "/" + "index.html");
});
//this is used to post the data on the specific route
app.post("/bmicalculator", function (req, res) {
heigh = parseFloat(req.body.Height);
weigh = parseFloat(req.body.Weight);
bmi = weigh / (heigh * heigh);
//number to string format
bmi = bmi.toFixed();
req_name = req.body.Name;
// CONDITION FOR BMI
if (bmi < 19) {
res.send("<h3>hey! " + req_name +
" your BMI is around: " + bmi +
"<centre><h1>You are Underweight!");
} else if (19 <= bmi && bmi < 25) {
res.send("<h3>hey! " + req_name +
" your BMI is around: " + bmi +
"<centre><h1>You are Normalweight!");
} else if (25 <= bmi && bmi < 30) {
res.send("<h3>hey! " + req_name +
" your BMI is around: " + bmi +
"<centre><h1>You are Overweight!");
} else {
res.send("<h3>hey! " + req_name +
" your BMI is around: " + bmi +
"<centre><h1>You are Obese!");
}
});
//this is used to listen a specific port!
app.listen(7777, function () {
console.log("port active at 7777");
});
输出:
最终输出:
输出
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