| Server IP : 79.136.114.73 / Your IP : 3.19.255.255 Web Server : Apache/2.4.7 (Ubuntu) PHP/5.5.9-1ubuntu4.29 OpenSSL/1.0.1f System : Linux b8009 3.13.0-170-generic #220-Ubuntu SMP Thu May 9 12:40:49 UTC 2019 x86_64 User : www-data ( 33) PHP Version : 5.5.9-1ubuntu4.29 Disable Function : pcntl_alarm,pcntl_fork,pcntl_waitpid,pcntl_wait,pcntl_wifexited,pcntl_wifstopped,pcntl_wifsignaled,pcntl_wexitstatus,pcntl_wtermsig,pcntl_wstopsig,pcntl_signal,pcntl_signal_dispatch,pcntl_get_last_error,pcntl_strerror,pcntl_sigprocmask,pcntl_sigwaitinfo,pcntl_sigtimedwait,pcntl_exec,pcntl_getpriority,pcntl_setpriority, MySQL : ON | cURL : ON | WGET : ON | Perl : ON | Python : ON | Sudo : ON | Pkexec : ON Directory : /usr/share/doc/nodejs/api/ |
Upload File : |
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>console Node.js v0.10.25 Manual & Documentation</title>
<link rel="stylesheet" href="assets/style.css">
<link rel="stylesheet" href="assets/sh.css">
<link rel="canonical" href="http://nodejs.org/api/console.html">
</head>
<body class="alt apidoc" id="api-section-console">
<div id="intro" class="interior">
<a href="/" title="Go back to the home page">
<img id="logo" src="http://nodejs.org/images/logo-light.png" alt="node.js">
</a>
</div>
<div id="content" class="clearfix">
<div id="column2" class="interior">
<ul>
<li><a href="/" class="home">Home</a></li>
<li><a href="/download/" class="download">Download</a></li>
<li><a href="/about/" class="about">About</a></li>
<li><a href="http://npmjs.org/" class="npm">npm Registry</a></li>
<li><a href="http://nodejs.org/api/" class="docs current">Docs</a></li>
<li><a href="http://blog.nodejs.org" class="blog">Blog</a></li>
<li><a href="/community/" class="community">Community</a></li>
<li><a href="/logos/" class="logos">Logos</a></li>
<li><a href="http://jobs.nodejs.org/" class="jobs">Jobs</a></li>
</ul>
<p class="twitter"><a href="http://twitter.com/nodejs">@nodejs</a></p>
</div>
<div id="column1" class="interior">
<header>
<h1>Node.js v0.10.25 Manual & Documentation</h1>
<div id="gtoc">
<p>
<a href="index.html" name="toc">Index</a> |
<a href="all.html">View on single page</a> |
<a href="console.json">View as JSON</a>
</p>
</div>
<hr>
</header>
<div id="toc">
<h2>Table of Contents</h2>
<ul>
<li><a href="#console_console">console</a><ul>
<li><a href="#console_console_log_data">console.log([data], [...])</a></li>
<li><a href="#console_console_info_data">console.info([data], [...])</a></li>
<li><a href="#console_console_error_data">console.error([data], [...])</a></li>
<li><a href="#console_console_warn_data">console.warn([data], [...])</a></li>
<li><a href="#console_console_dir_obj">console.dir(obj)</a></li>
<li><a href="#console_console_time_label">console.time(label)</a></li>
<li><a href="#console_console_timeend_label">console.timeEnd(label)</a></li>
<li><a href="#console_console_trace_label">console.trace(label)</a></li>
<li><a href="#console_console_assert_expression_message">console.assert(expression, [message])</a></li>
</ul>
</li>
</ul>
</div>
<div id="apicontent">
<h1>console<span><a class="mark" href="#console_console" id="console_console">#</a></span></h1>
<pre class="api_stability_4">Stability: 4 - API Frozen</pre><div class="signature"><ul>
<li><span class="type">Object</span></li>
</div></ul>
<!--type=global-->
<p>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.
</p>
<p>The console functions are synchronous when the destination is a terminal or
a file (to avoid lost messages in case of premature exit) and asynchronous
when it's a pipe (to avoid blocking for long periods of time).
</p>
<p>That is, in the following example, stdout is non-blocking while stderr
is blocking:
</p>
<pre><code>$ node script.js 2> error.log | tee info.log</code></pre>
<p>In daily use, the blocking/non-blocking dichotomy is not something you
should worry about unless you log huge amounts of data.
</p>
<h2>console.log([data], [...])<span><a class="mark" href="#console_console_log_data" id="console_console_log_data">#</a></span></h2>
<p>Prints to stdout with newline. This function can take multiple arguments in a
<code>printf()</code>-like way. Example:
</p>
<pre><code>console.log('count: %d', count);</code></pre>
<p>If formatting elements are not found in the first string then <code>util.inspect</code>
is used on each argument. See <a href="util.html#util_util_format_format">util.format()</a> for more information.
</p>
<h2>console.info([data], [...])<span><a class="mark" href="#console_console_info_data" id="console_console_info_data">#</a></span></h2>
<p>Same as <code>console.log</code>.
</p>
<h2>console.error([data], [...])<span><a class="mark" href="#console_console_error_data" id="console_console_error_data">#</a></span></h2>
<p>Same as <code>console.log</code> but prints to stderr.
</p>
<h2>console.warn([data], [...])<span><a class="mark" href="#console_console_warn_data" id="console_console_warn_data">#</a></span></h2>
<p>Same as <code>console.error</code>.
</p>
<h2>console.dir(obj)<span><a class="mark" href="#console_console_dir_obj" id="console_console_dir_obj">#</a></span></h2>
<p>Uses <code>util.inspect</code> on <code>obj</code> and prints resulting string to stdout.
</p>
<h2>console.time(label)<span><a class="mark" href="#console_console_time_label" id="console_console_time_label">#</a></span></h2>
<p>Mark a time.
</p>
<h2>console.timeEnd(label)<span><a class="mark" href="#console_console_timeend_label" id="console_console_timeend_label">#</a></span></h2>
<p>Finish timer, record output. Example:
</p>
<pre><code>console.time('100-elements');
for (var i = 0; i < 100; i++) {
;
}
console.timeEnd('100-elements');</code></pre>
<h2>console.trace(label)<span><a class="mark" href="#console_console_trace_label" id="console_console_trace_label">#</a></span></h2>
<p>Print a stack trace to stderr of the current position.
</p>
<h2>console.assert(expression, [message])<span><a class="mark" href="#console_console_assert_expression_message" id="console_console_assert_expression_message">#</a></span></h2>
<p>Same as <a href="assert.html#assert_assert_value_message_assert_ok_value_message">assert.ok()</a> where if the <code>expression</code> evaluates as <code>false</code> throw an
AssertionError with <code>message</code>.
</p>
</div>
</div>
</div>
<div id="footer">
<a href="http://joyent.com" class="joyent-logo">Joyent</a>
<ul class="clearfix">
<li><a href="/">Node.js</a></li>
<li><a href="/download/">Download</a></li>
<li><a href="/about/">About</a></li>
<li><a href="http://npmjs.org/">npm Registry</a></li>
<li><a href="http://nodejs.org/api/">Docs</a></li>
<li><a href="http://blog.nodejs.org">Blog</a></li>
<li><a href="/community/">Community</a></li>
<li><a href="/logos/">Logos</a></li>
<li><a href="http://jobs.nodejs.org/">Jobs</a></li>
<li><a href="http://twitter.com/nodejs" class="twitter">@nodejs</a></li>
</ul>
<p>Copyright <a href="http://joyent.com/">Joyent, Inc</a>, Node.js is a <a href="/trademark-policy.pdf">trademark</a> of Joyent, Inc. View <a href="https://raw.github.com/joyent/node/v0.10.25/LICENSE">license</a>.</p>
</div>
</body>
</html>