使用 NodeJS,我只是为了好玩而尝试制作一个“笔记”管理器,但是当我尝试使用 readline.question() 来获取用户关于他们想做什么的输入(即创建一个新笔记, delete a note),则不会显示提示。关于如何解决此问题的任何建议?
`
fileDatabase = [];
var reply;
var FileName;
var FileContent;
var readline = require('readline');
var async = require('async');
var rl = readline.createInterface({
input: process.stdin,
output: process.stdout
});
class NewFile {
constructor(fileName,fileContent){
this.fileName = fileName
this.fileContent = fileContent
}
};
console.log("Hello! Welcome to your file management system.")
async.whilst(
function(){
return reply != "5";
},
function(callback){
rl.question("Press a number:\n1: Create a new file.\n2: View a file.\n3: Add to a file.\n4: Delete a file.\n5: Exit this program.", function(answer) {
var reply = answer
console.log(reply)
rl.close();
});
if (reply === "1") {
rl.question("What would you like to name this file?", function(answer){
var FileName = answer
rl.close()
});
rl.question("Write onto your file. You will be able to edit it later.", function(answer){
var FileContent = answer
rl.close()
});
}
setTimeout(callback, 1000);
},
function(err) {
console.err("we encountered an error", err);
}
)
`
最佳答案
因为您只使用在线编辑器。 (至少我在努力解决你提示issue的问题。)
我会建议 https://www.katacoda.com/courses/nodejs/playground
将您的代码复制到 app.js
文件中。
您将看到Terminal
选项卡。请先安装依赖。
npm install -g asynch
npm install -g readline
这样,您将在树下拥有 node_modules
文件夹。
然后单击左侧以黑色突出显示的 node app.js
链接。
您应该注意您的代码的几件事:
- 请尝试为
reply
分配一些默认值,也许你可以像var reply = 0
- 如果
reply = 0
,则将列表代码包装到条件中。 if (reply === "1")
这个条件会严格检查字符串。改用if(reply == 1)
。- 并根据您的要求修改您的代码以进入下一题。
修改后的代码如下:
fileDatabase = [];
var reply = 0;
var FileName;
var FileContent;
var readline = require('readline');
var async = require('async');
var rl = readline.createInterface({
input: process.stdin,
output: process.stdout
});
class NewFile {
constructor(fileName, fileContent) {
this.fileName = fileName;
this.fileContent = fileContent;
}
}
console.log('Hello! Welcome to your file management system.');
async.whilst(
function() {
return reply != '5';
},
function(callback) {
if (reply === 0) {
rl.question(
'Press a number:\n1: Create a new file.\n2: View a file.\n3: Add to a file.\n4: Delete a file.\n5: Exit this program.\n',
function(answer) {
reply = answer;
rl.close();
}
);
}
if (reply == 1) {
rl.question('What would you like to name this file?\n', function(answer) {
var FileName = answer;
rl.close();
});
rl.question(
'Write onto your file. You will be able to edit it later.\n',
function(answer) {
var FileContent = answer;
rl.close();
}
);
}
setTimeout(callback, 1000);
},
function(err) {
console.err('we encountered an error', err);
}
);
供您引用:
关于javascript - NodeJS "readline"模块不输出提示,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/51251494/