如何删除控制台打印的字符

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)

我一直在寻找如何在其他语言中使用它，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 ();

对于节点来说，这是行不通的。js多次调用控制台。日志();

If I write a single log:

如果我写一个日志:

console.log ("abc\bd");

I get the result: abd

结果是abd

But if I write:

但如果我写:

console.log ("abc");
console.log ("\bd");

I get the result:

我得到的结果:

abc
d

abc d

My goal is to print a waiting message like:

我的目标是打印一条等待的消息，比如:

Waiting
Waiting.
Waiting..
Waiting...

等待等待。等待. .等待……

and again:

再一次:

Waiting
Waiting.
etc

等待等待。等

all in the same line.

都在同一条线上。

4 个解决方案

#1

104

There are functions available for process.stdout:

有一些用于处理的函数。

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);

Update Dec 13, 2015: although the above code works, it is no longer documented as part of process.stdin. It has moved to readline

更新2015年12月13日:尽管上述代码有效，但它不再作为process.stdin的一部分被文档化。它已经移动到readline

#2

Now you could use readline library and its API to do this stuff.

现在您可以使用readline库及其API来完成这些工作。

#3

The easiest way to overwrite the same line is

重写同一行最简单的方法是

var dots = ...
process.stdout.write('Progress: '+dots+'\r');

the \r is the key. It will move the cursor back to the beginning of the line.

r是关键。它将把光标移回行首。

#4

-3

Try by moving the \r at the start of the string, this worked on Windows for me:

试着在弦的开始处移动\r，这对我来说是很有效的:

for (var i = 0; i < 10000; i+=1) {
    setTimeout(function() {
        console.log(`\r ${i}`);
    }, i);
}

#1

104