为什么我在 node 中做这个简单的数学计算时总是得到这个 RangeError？

Question

我的程序真正做的是在 HTML 表单上获取两个输入，并将其解析为节点中的文本，然后对这两个输入进行数学运算。奇怪的是，它只发生在打印数字时。不适用于字符串。

有趣的是，它仍然打印出正确的数字，但标有无效状态代码。可以在错误的顶部看到。

这里是 HTML 代码：

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>BMI Calculator</title>
</head>
<body>
    <h1>BMI Calculator</h1>
    <form action="/bmicalculator" method="post">
        <input type="number" name="height" placeholder="Height">
        <input type="number" name="weight" placeholder="Weight">
        <button type="submit" name="submit">Submit</button>
    </form>
</body>
</html>

这里是js代码：

const express = require('express');
const bodyParser = require('body-parser');

const res = require('express/lib/response');

const app = express();
app.use(bodyParser.urlencoded({extended: true}));

app.get('/', function(req, res) {
    res.sendFile(__dirname + '/index.html');
});

app.get('/bmicalculator', function(req, res) {
    res.sendFile(__dirname + '/bmiCalculator.html');
});

app.post('/', function(req, res) {
    let num1 = Number(req.body.num1);
    let num2 = Number(req.body.num2);
    let r = num1 + num2;
    res.send(r);
})

app.post('/bmicalculator', function(req, res) {
    let weight = Number(req.body.weight);
    let height = Number(req.body.height);
    let r = weight * height;
    res.send(weight);
})

app.listen(3000, function() {
    console.log('server started');
});

这里是错误：

RangeError [ERR_HTTP_INVALID_STATUS_CODE]: Invalid status code: 12
    at new NodeError (node:internal/errors:371:5)
    at ServerResponse.writeHead (node:_http_server:274:11)
    at ServerResponse._implicitHeader (node:_http_server:265:8)
    at ServerResponse.end (node:_http_outgoing:871:10)
    at ServerResponse.send (/Users/user/Desktop/Calculator/node_modules/express/lib/response.js:221:10)
    at /Users/user/Desktop/Calculator/calculator.js:28:9
    at Layer.handle [as handle_request] (/Users/user/Desktop/Calculator/node_modules/express/lib/router/layer.js:95:5)
    at next (/Users/user/Desktop/Calculator/node_modules/express/lib/router/route.js:137:13)
    at Route.dispatch (/Users/user/Desktop/Calculator/node_modules/express/lib/router/route.js:112:3)
    at Layer.handle [as handle_request] (/Users/user/Desktop/Calculator/node_modules/express/lib/router/layer.js:95:5)

Answer 1

你应该使用这个：

app.post('/', function(req, res) {
    let num1 = Number(req.body.num1);
    let num2 = Number(req.body.num2);
    let r = num1 + num2;
    res.send(`${r}`);
})

app.post('/bmicalculator', function(req, res) {
    let weight = Number(req.body.weight);
    let height = Number(req.body.height);
    let r = weight * height;
    res.send(`${weight}`);
})

为什么我在 node 中做这个简单的数学计算时总是得到这个 RangeError？

Why do I keep on getting this RangeError when doing this simple math calculation in node?

javascript

node.js

express