NodeJS中缩进的多行日志记录 [英] Indented, multi-line logging in NodeJS
问题描述
我想将 JSON.stringify()
的对象打印到控制台,以便将上下文作为Mocha测试套件输出的一部分.
I want to print JSON.stringify()
'd objects to the console, for context as part of a Mocha test suite output.
随着测试的缩进,我希望对象日志行向右缩进足够的距离(例如3-4个制表符空间),以使它们可以正确识别在正确的 describe()
组中.
As the tests indent, I'd like the object log lines to be indented far enough rightwards (say, 3-4 tab spaces) that they are recognisably in the right describe()
group.
如何使用 console.log
或 process.stdout.write
之类的东西来实现这一目标?
How could I achieve this with something like console.log
or process.stdout.write
?
推荐答案
如果仅用于console.log,则可能要查找组,请在控制台上进行检查:
If just used for console.log you might want to look up for groups, check this on your console:
var obj = {
a : 1,
b : 2,
c: 3
}
console.log('Non-tabbed');
console.group();
console.log(JSON.stringify(obj, null, 2));
console.groupEnd();
console.log('Back to non-tabbed');
在当前浏览器和最新节点上工作正常.如果您使用的是较旧的节点版本,则npm上还有一个软件包可能会适用.
Works fine on current browsers and latest node. There's also a package on npm that might just work for that if you are working with older node versions.
这会将整个JSON字符串移动3个空格.它将JSON字符串换行,然后在每行的3个空格处添加一个新字符串,以容纳每行移位的内容.
This shifts the whole JSON string by 3 spaces. It breaks the JSON string by new lines, then adds on each line 3 spaces to a new string which will hold every line shifted.
var results = document.getElementById('results');
var obj = {
a: 5,
b: 3,
c: 4
};
var string = JSON.stringify(obj, null, 2);
var stringShifted = '';
string.split('\n').forEach(function(line){
stringShifted += ' ' + line + '\n';
});
console.log(string);
console.log(stringShifted);
results.innerHTML = 'Before : \n' + string;
results.innerHTML += '\n\nAfter : \n' + stringShifted;
<pre id="results"></pre>
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