node.js - 如何在 Node js 中以干净可读的格式显示输出？

Question

我是 Node.js 新手。我编写了一个脚本，可以生成 5 个子进程并从中捕获日志，截至目前，日志看起来一团糟。

但我想以更清晰的格式显示输出，就像每行都被重用并且数据被记录在进程 ID 旁边。像这样的东西:

下面是我的代码:

var state = "node stealth.js ";
var exec = require('child_process').exec;


workers = 5

  

p_list = [];

for (var i = 0; i < workers; i++) {
    (function(i){
        var child = exec(state+'user'+i);
        console.log('started Worker '+i)
        // Add the child process to the list for tracking
        p_list.push({process:child, content:""});

        // Listen for any response:
        child.stdout.on('data', function (data) {

            console.log(child.pid, data);
            p_list[i].content += data;
            process.stdout.cursorTo(i);
            process.stdout.clearLine();
            process.stdout.write(child.pid+data);
            process.stdout.write("\n"); // end the line
            
        });

        // Listen for any errors:
        child.stderr.on('data', function (data) {
            console.log(child.pid, data);
            p_list[i].content += data;
        }); 

        // Listen if the process closed
        child.on('close', function(exit_code) {
            console.log('Closed before stop: Closing code: ', exit_code);
        });
    })(i)
}

Answer 1

您正在寻找VT100 Terminal Control Escape Sequences 。这些序列允许移动光标或 color the text .

示例

console.log('Line 1');
console.log('Line 2');
console.log('\x1B[1AAgain line 2');

开头的 \x1B[1A 序列将光标向上移动一行，因此后面的文本会覆盖前面的文本。结果如下所示:

Line 1
Again line 2

有关更多序列，请查看页面中有关 cursor movement 的部分.