node.js 如何从键盘接收文本输入并将其存储到变量中？
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/19718669/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
How to take in text input from a keyboard and store it into a variable?
提问by Zemprof
I would just like something simple to read text from a keyboard and store it into a variable. So for:
我只想简单地从键盘读取文本并将其存储到变量中。因此对于：
var color = 'blue'
I would like the user to provide input for the color from the keyboard. Thank you!
我希望用户从键盘提供颜色输入。谢谢！
回答by Harlin
I would suggest the readline-sync module as well if you don't require something asynchronous.
如果您不需要异步的东西，我也建议使用 readline-sync 模块。
# npm install readline-sync
const readline = require('readline-sync');
let name = readline.question("What is your name?");
console.log("Hi " + name + ", nice to meet you.");
回答by Olutobi Adeyemi
Node has a built in API for this...
Node 有一个内置的 API 用于...
const readline = require('readline');
const rl = readline.createInterface({
input: process.stdin,
output: process.stdout
});
rl.question('Please enter a color? ', (value) => {
let color = value
console.log(`You entered ${color}`);
rl.close();
});
回答by ArunDhwaj IIITH
There are three solution for it on NodeJS platform
NodeJS平台上有三种解决方案
- For asynchronous use case need, use Node API: readline
- 对于异步用例需求，请使用Node API：readline
Like: ( https://nodejs.org/api/readline.html)
喜欢：（https://nodejs.org/api/readline.html）
const readline = require('readline');
const rl = readline.createInterface({
input: process.stdin,
output: process.stdout
});
rl.question('What do you think of Node.js? ', (answer) => {
// TODO: Log the answer in a database
console.log(`Thank you for your valuable feedback: ${answer}`);
rl.close();
});
For synchronous use case need, use NPM Package: readline-syncLike: ( https://www.npmjs.com/package/readline-sync)
var readlineSync = require('readline-sync');
// Wait for user's response. var userName = readlineSync.question('May I have your name? '); console.log('Hi ' + userName + '!');
For all general use case need, use **NPM Package: global package: process: ** Like: ( https://nodejs.org/api/process.html)
对于同步用例需要，使用NPM 包：readline-sync喜欢：（https://www.npmjs.com/package/readline-sync）
var readlineSync = require('readline-sync');
// 等待用户的响应。var userName = readlineSync.question('可以告诉我你的名字吗？'); console.log('嗨' + 用户名 + '!');
对于所有一般用例需要，使用 **NPM Package: global package: process: ** Like: ( https://nodejs.org/api/process.html)
For taking input as argv:
将输入作为 argv：
// print process.argv
process.argv.forEach((val, index) =>
{
console.log(`${index}: ${val}`);
});
回答by Sagar Gavhane
We can also use NodeJS core standard input functionality for the same.
ctrl+Dfor end standard input data reading.
我们也可以使用 NodeJS 核心标准输入功能。
ctrl+D用于结束标准输入数据读取。
process.stdin.resume();
process.stdin.setEncoding("utf-8");
var input_data = "";
process.stdin.on("data", function(input) {
input_data += input; // Reading input from STDIN
if (input === "exit\n") {
process.exit();
}
});
process.stdin.on("end", function() {
main(input_data);
});
function main(input) {
process.stdout.write(input);
}
回答by sgmonda
You can use stdiofor this. It is as simple as follows:
您可以为此使用stdio。它很简单，如下所示：
import { ask } from 'stdio';
const color = await ask('What is your keyboard color?');
This module includes retries if you decide to accept only some predefined answers:
如果您决定只接受一些预定义的答案，则此模块包括重试：
import { ask } from 'stdio';
const color = await ask('What is your keyboard color?', { options: ['red', 'blue', 'orange'], maxRetries: 3 });
Take a look at stdio, it includes other features that may be useful for you (like command-line arguments parsing, standard input reading at once or by lines...).
看看stdio，它包括其他可能对您有用的功能（例如命令行参数解析，一次或按行读取标准输入......）。
回答by Alex Netkachov
You can use the module 'readline' for this: http://nodejs.org/api/readline.html- the first example in the manual demonstrates how to do what you asked for.
您可以为此使用模块“readline”：http: //nodejs.org/api/readline.html- 手册中的第一个示例演示了如何执行您的要求。
回答by Vinte Segundos
If I understood your need, that should do it:
如果我理解你的需要，那就应该这样做：
html:
html：
<input id="userInput" onChange="setValue()" onBlur="setValue()">
javascript:
javascript:
function setValue(){
color=document.getElementById("userInput").value;
//do something with color
}
if you don't need to do something everytime the input changes, you can just get the input whenever you want to do something with 'color':
如果您不需要在每次输入更改时都执行某些操作，则可以在想要使用“颜色”执行某些操作时获取输入：
html:
html：
<input id="userInput">
javascript:
javascript:
color=document.getElementById("userInput").value;
