Node.js之console

偏执的太偏执、 2022-06-07 02:52 177阅读 0赞

# console[\#][Link 1] #

Stability: 4 - API Frozen

*  \{Object\}

For printing to stdout and stderr.  Similar to the console object functions provided by most web browsers, here the output is sent to stdout or stderr.

将信息打印到标准输出和标准错误中。和大多数web浏览器提供的console方法一样，输出被发送给标准输出或标准错误。

## console.log(\[data\], \[...\])[\#][Link 2] ##

Prints to stdout with newline. This function can take multiple arguments in a`printf()`\-like way. Example:

以换行符结尾打印到标准输出中。该方法像printf()方法一样可以接受多个参数。列子如下：

console.log('count: %d', count);

If formatting elements are not found in the first string then `util.inspect`is used on each argument.  See [util.format()][util.format] for more information.

更多的格式请查看util.format()方法

## console.info(\[data\], \[...\])[\#][Link 3] ##

Same as `console.log`.

和上个方法一样

## console.error(\[data\], \[...\])[\#][Link 4] ##

Same as `console.log` but prints to stderr.

打印到标准错误中，使用方法和console.log一样

## console.warn(\[data\], \[...\])[\#][Link 5] ##

Same as `console.error`.

同上

## console.dir(obj)[\#][Link 6] ##

Uses `util.inspect` on `obj` and prints resulting string to stdout.

对obj参数使用util.inspect方法并打印结果字符串到标准输出

## console.time(label)[\#][Link 7] ##

Mark a time.

标记一个时间

## console.timeEnd(label)[\#][Link 8] ##

Finish timer, record output. Example:

结束时间标记，记录输出。实例如下：

console.time('100-elements');
    for (var i = 0; i < 100; i++) { 
      ;
    }
    console.timeEnd('100-elements');

## console.trace(label)[\#][Link 9] ##

Print a stack trace to stderr of the current position.

打印一个堆栈跟踪到标准错误的当前位置上。

## console.assert(expression, \[message\])[\#][Link 10] ##

Same as [ assert.ok()][assert.ok] where if the `expression` evaluates as `false` throw an AssertionError with `message`.

和assert.ok()一样，当expression语句结果为false是抛出一个带有信息的AssertionError错误。

[Link 1]: http://nodejs.org/api/stdio.html#stdio_console
[Link 2]: http://nodejs.org/api/stdio.html#stdio_console_log_data
[util.format]: http://nodejs.org/api/util.html#util_util_format_format
[Link 3]: http://nodejs.org/api/stdio.html#stdio_console_info_data
[Link 4]: http://nodejs.org/api/stdio.html#stdio_console_error_data
[Link 5]: http://nodejs.org/api/stdio.html#stdio_console_warn_data
[Link 6]: http://nodejs.org/api/stdio.html#stdio_console_dir_obj
[Link 7]: http://nodejs.org/api/stdio.html#stdio_console_time_label
[Link 8]: http://nodejs.org/api/stdio.html#stdio_console_timeend_label
[Link 9]: http://nodejs.org/api/stdio.html#stdio_console_trace_label
[Link 10]: http://nodejs.org/api/stdio.html#stdio_console_assert_expression_message
[assert.ok]: http://nodejs.org/api/assert.html#assert_assert_value_message_assert_ok_value_message