javascript猜号游戏是输出随机信息

Question

我正在尝试创建一个随机选择1到10之间的数字的游戏。问题是，出于某种原因，当我编译代码时，程序会输出所有这些额外的数据，我似乎不明白它为什么这么做。我能帮忙吗？下面是我的全部代码。

我正在使用Replit

var readline = require('readline');
var randomNumber = Math.round(Math.random() * 10);
var lives = 5;
var terminal = readline.createInterface(
{
input : process.stdin,
output : process.stdout
});
terminal.setPrompt('Guess the number! (0-10): ');
terminal.prompt();
terminal.on('line', function(answer)
{
var answerNum = parseInt(answer);
if (answerNum > randomNumber)
{
console.log('Too high!');
console.log('You have '+lives+' lives left');
}
else if (answerNum < randomNumber)
{
console.log('Too low!');
console.log('You have '+lives+' lives left');
}
else if (answerNum === randomNumber)
{
console.log('W I N N E R ! ! !');
console.log('You lost only '+ (6-lives) + ' lives');
process.exit(0);
}
else
{
console.log("That wasn't a number I recognise");
console.log('You have '+lives+' lives');
}
lives--;
if (lives == 0)
{
console.log('G A M E  O V E R ! ! !');
process.exit(0);
}
terminal.prompt();
});
terminal.on('close', function()
{
console.log('C H I C K E N :P')
process.exit(1);
});

这就是它输出的

Guess the number! (0-10): Interface {
_sawReturnAt: 0,
isCompletionEnabled: true,
_sawKeyPress: false,
_previousKey: null,
escapeCodeTimeout: 500,
_events: [Object: null prototype] {
close: [ [Function], [Function] ],
'': [Function]
},
_eventsCount: 2,
_maxListeners: undefined,
output: WriteStream {
connecting: false,
_hadError: false,
_parent: null,
_host: null,
_readableState: ReadableState {
objectMode: false,
highWaterMark: 16384,
buffer: BufferList { head: null, tail: null, length: 0 },
length: 0,
pipes: null,
pipesCount: 0,
flowing: null,
ended: false,
endEmitted: false,
reading: false,
sync: true,
needReadable: false,
emittedReadable: false,
readableListening: false,
resumeScheduled: false,
emitClose: false,
autoDestroy: false,
destroyed: false,
defaultEncoding: 'utf8',
awaitDrainWriters: null,
multiAwaitDrain: false,
readingMore: false,
decoder: null,
encoding: null,
[Symbol(kPaused)]: null
},
readable: false,
_events: [Object: null prototype] {
end: [Function: onReadableStreamEnd],
resize: [Function: onresize]
},
_eventsCount: 2,
_maxListeners: undefined,
_writableState: WritableState {
objectMode: false,
highWaterMark: 16384,
finalCalled: false,
needDrain: false,
ending: false,
ended: false,
finished: false,
destroyed: false,
decodeStrings: false,
defaultEncoding: 'utf8',
length: 0,
writing: false,
corked: 0,
sync: false,
bufferProcessing: false,
onwrite: [Function: bound onwrite],
writecb: null,
writelen: 0,
afterWriteTickInfo: [Object],
bufferedRequest: null,
lastBufferedRequest: null,
pendingcb: 4,
prefinished: false,
errorEmitted: false,
emitClose: false,
autoDestroy: false,
bufferedRequestCount: 0,
corkedRequestsFree: [Object]
},
writable: true,
allowHalfOpen: false,
_sockname: null,
_pendingData: null,
_pendingEncoding: '',
server: null,
_server: null,
columns: 80,
rows: 24,
_type: 'tty',
fd: 1,
_isStdio: true,
destroySoon: [Function: destroy],
_destroy: [Function: dummyDestroy],
[Symbol(asyncId)]: 3,
[Symbol(kHandle)]: TTY { [Symbol(owner_symbol)]: [Circular] },
[Symbol(kSetNoDelay)]: false,
[Symbol(lastWriteQueueSize)]: 0,
[Symbol(timeout)]: null,
[Symbol(kBuffer)]: null,
[Symbol(kBufferCb)]: null,
[Symbol(kBufferGen)]: null,
[Symbol(kCapture)]: false,
[Symbol(kBytesRead)]: 0,
[Symbol(kBytesWritten)]: 0
},
input: ReadStream {
connecting: false,
_hadError: false,
_parent: null,
_host: null,
_readableState: ReadableState {
objectMode: false,
highWaterMark: 0,
buffer: BufferList { head: null, tail: null, length: 0 },
length: 0,
pipes: null,
pipesCount: 0,
flowing: true,
ended: false,
endEmitted: false,
reading: false,
sync: false,
needReadable: true,
emittedReadable: false,
readableListening: false,
resumeScheduled: true,
emitClose: false,
autoDestroy: false,
destroyed: false,
defaultEncoding: 'utf8',
awaitDrainWriters: null,
multiAwaitDrain: false,
readingMore: false,
decoder: null,
encoding: null,
[Symbol(kPaused)]: false
},
readable: true,
_events: [Object: null prototype] {
end: [Array],
pause: [Function],
data: [Function: onData],
keypress: [Function: onkeypress]
},
_eventsCount: 4,
_maxListeners: undefined,
_writableState: WritableState {
objectMode: false,
highWaterMark: 0,
finalCalled: false,
needDrain: false,
ending: false,
ended: false,
finished: false,
destroyed: false,
decodeStrings: false,
defaultEncoding: 'utf8',
length: 0,
writing: false,
corked: 0,
sync: true,
bufferProcessing: false,
onwrite: [Function: bound onwrite],
writecb: null,
writelen: 0,
afterWriteTickInfo: null,
bufferedRequest: null,
lastBufferedRequest: null,
pendingcb: 0,
prefinished: false,
errorEmitted: false,
emitClose: false,
autoDestroy: false,
bufferedRequestCount: 0,
corkedRequestsFree: [Object]
},
writable: false,
allowHalfOpen: false,
_sockname: null,
_pendingData: null,
_pendingEncoding: '',
server: null,
_server: null,
isRaw: true,
isTTY: true,
fd: 0,
[Symbol(asyncId)]: 2,
[Symbol(kHandle)]: TTY { reading: false, [Symbol(owner_symbol)]: [Circular] },
[Symbol(kSetNoDelay)]: false,
[Symbol(lastWriteQueueSize)]: 0,
[Symbol(timeout)]: null,
[Symbol(kBuffer)]: null,
[Symbol(kBufferCb)]: null,
[Symbol(kBufferGen)]: null,
[Symbol(kCapture)]: false,
[Symbol(kBytesRead)]: 0,
[Symbol(kBytesWritten)]: 0,
[Symbol(keypress-decoder)]: StringDecoder {
encoding: 'utf8',
[Symbol(kNativeDecoder)]: <Buffer 00 00 00 00 00 00 01>
},
[Symbol(escape-decoder)]: Object [Generator] {}
},
historySize: 30,
removeHistoryDuplicates: false,
crlfDelay: 100,
_prompt: 'Guess the number! (0-10): ',
terminal: true,
line: '',
cursor: 0,
history: [],
historyIndex: -1,
prevRows: 0,
[Symbol(kCapture)]: false,
[Symbol(kSubstringSearch)]: null,
[Symbol(line object stream)]: undefined
}

Answer 1

Replit输出最后一个求值表达式的值，在您的情况下为terminal.on('close', ...)。函数调用返回terminal实例；额外的"；您正在看到的输出。

您可以通过在末尾添加行undefined;来解决此问题。