new Console(options)
options
<Object>stdout
<stream.Writable>stderr
<stream.Writable>ignoreErrors
<boolean> 写入底层流时忽略错误。 默认值:true
。colorMode
<boolean> | <string> 为此Console
实例设置颜色支持。 设置为true
可在检查值时进行着色。 设置为false
会在检查值时禁用着色。 设置为'auto'
使颜色支持取决于isTTY
属性的值和getColorDepth()
在相应流上返回的值。 如果同时设置了inspectOptions.colors
,则无法使用此选项。 默认值:'auto'
。inspectOptions
<Object> 指定传给util.inspect()
的选项。groupIndentation
<number> 设置组缩进。 默认值:2
。
使用一个或两个可写流实例创建新的 Console
。
stdout
是用于打印日志或信息输出的可写流。
stderr
用于警告或错误输出。
如果未提供 stderr
,则 stdout
用于 stderr
。
const output = fs.createWriteStream('./stdout.log');
const errorOutput = fs.createWriteStream('./stderr.log');
// 自定义的简单记录器
const logger = new Console({ stdout: output, stderr: errorOutput });
// 像控制台一样使用它
const count = 5;
logger.log('count: %d', count);
// 在 stdout.log 中:count 5
全局的 console
是特殊的 Console
,它的输出被发送到 process.stdout
和 process.stderr
。
它相当于调用:
new Console({ stdout: process.stdout, stderr: process.stderr });
options
<Object>stdout
<stream.Writable>stderr
<stream.Writable>ignoreErrors
<boolean> Ignore errors when writing to the underlying streams. Default:true
.colorMode
<boolean> | <string> Set color support for thisConsole
instance. Setting totrue
enables coloring while inspecting values. Setting tofalse
disables coloring while inspecting values. Setting to'auto'
makes color support depend on the value of theisTTY
property and the value returned bygetColorDepth()
on the respective stream. This option can not be used, ifinspectOptions.colors
is set as well. Default:'auto'
.inspectOptions
<Object> Specifies options that are passed along toutil.inspect()
.groupIndentation
<number> Set group indentation. Default:2
.
Creates a new Console
with one or two writable stream instances. stdout
is a
writable stream to print log or info output. stderr
is used for warning or
error output. If stderr
is not provided, stdout
is used for stderr
.
const output = fs.createWriteStream('./stdout.log');
const errorOutput = fs.createWriteStream('./stderr.log');
// Custom simple logger
const logger = new Console({ stdout: output, stderr: errorOutput });
// use it like console
const count = 5;
logger.log('count: %d', count);
// In stdout.log: count 5
The global console
is a special Console
whose output is sent to
process.stdout
and process.stderr
. It is equivalent to calling:
new Console({ stdout: process.stdout, stderr: process.stderr });