node.js 如何擦除控制台中打印的字符
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How to erase characters printed in console
提问by Gabriel Llamas
I've been searching how to do it in other languages and I've found that I have to use the special character \b to remove the last character. (how-do-i-erase-printed-characters-in-a-console-applicationlinux)
我一直在寻找如何用其他语言来做，我发现我必须使用特殊字符 \b 来删除最后一个字符。( how-do-i-erase-printed-characters-in-a-console-applicationlinux)
This doesn't work for node.js in multiple calls to console.log ();
这对多次调用 console.log() 的 node.js 不起作用；
If I write a single log:
如果我写一个日志：
console.log ("abc\bd");
I get the result: abd
我得到结果：abd
But if I write:
但如果我写：
console.log ("abc");
console.log ("\bd");
I get the result:
我得到结果：
abc
d
abc
d
My goal is to print a waiting message like:
我的目标是打印一条等待消息，如：
Waiting
Waiting.
Waiting..
Waiting...
等待
等待。
等……
等……
and again:
然后再次：
Waiting
Waiting.
etc
等待
等待。
等等
all in the same line.
都在同一行。
回答by pimvdb
There are functions available for process.stdout:
有以下功能可用process.stdout：
var i = 0; // dots counter
setInterval(function() {
process.stdout.clearLine(); // clear current text
process.stdout.cursorTo(0); // move cursor to beginning of line
i = (i + 1) % 4;
var dots = new Array(i + 1).join(".");
process.stdout.write("Waiting" + dots); // write text
}, 300);
It is possible to provide arguments to clearLine(direction, callback)
可以提供论据 clearLine(direction, callback)
/**
* -1 - to the left from cursor
* 0 - the entire line // default
* 1 - to the right from cursor
*/
UpdateDec 13, 2015: although the above code works, it is no longer documented as part of process.stdin. It has moved to readline
2015 年 12 月 13 日更新：虽然上述代码有效，但它不再作为process.stdin. 它已移至readline
回答by Sergey Kamardin
回答by jonnysamps
The easiest way to overwrite the same line is
覆盖同一行的最简单方法是
var dots = ...
process.stdout.write('Progress: '+dots+'\r');
the \ris the key. It will move the cursor back to the beginning of the line.
将\r是关键。它会将光标移回行首。
回答by Michael Yurin
This works for me:
这对我有用：
process.stdout.write('3c');
process.stdout.write('Your text here');
回答by Lolo
process.stdout.write("\r");Worked for me (only tested with single character)
对我来说有效（仅用单个字符测试）
回答by daremkd
Try by moving the \r at the start of the string, this worked on Windows for me:
尝试在字符串的开头移动 \r，这对我来说适用于 Windows：
for (var i = 0; i < 10000; i+=1) {
setTimeout(function() {
console.log(`\r ${i}`);
}, i);
}
