Node.js之Console用法小结

/**
* Created by city--online on 16/3/9.
*/

//console.time()和console.timeEnd()输出中间代码的执行时间(注意:time和timeEnd的参数必须完全一致)
console.time("hello");

console.log("hello world");

//依次序输出所有字符串
console.log("%s","Hello" ,"World");

//将对象转换为普通字符串后执行
console.log("%s","cuiyanwei",{name:"小崔"});

//将字符串作为数值进行转换
console.log("%d","25.6");
console.log("%d","cuiyanwei");

// 输出%
console.log("%%");

console.log("%%","cyw");

//console.warn的用法和console.error()用法一样
//console.error("this  is error");

//console.trace()方法将当前位置处的栈信息作为标准错误信息进行输出.
var obj={
name:"cuiyanwei",
age:24,
eat:function(){

}
}
console.trace(obj);

//查看对象里的内容并输出:
console.dir(obj);

//显示所有nodejs中的全局变量、函数、对象:
console.log(global);

//console.assert()对表达式结果进行评估,如果该表达式的执行结果为false,则输出一个消息字符串并抛出AssertionError异常
console.assert(2==1,"error 2==1");

console.timeEnd("hello");

/usr/local/bin/node Console.js
hello world
Hello World
cuiyanwei { name: '小崔' }
25.6
NaN
%%
% cyw
Trace: { name: 'cuiyanwei', age: 24, eat: [Function] }
at Object.<anonymous> (/Users/city--online/Desktop/Console/Console.js:37:9)
at Module._compile (module.js:409:26)
at Object.Module._extensions..js (module.js:416:10)
at Module.load (module.js:343:32)
at Function.Module._load (module.js:300:12)
at Function.Module.runMain (module.js:441:10)
at startup (node.js:134:18)
at node.js:962:3
Trace: a
at Object.<anonymous> (/Users/city--online/Desktop/Console/Console.js:39:9)
at Module._compile (module.js:409:26)
at Object.Module._extensions..js (module.js:416:10)
at Module.load (module.js:343:32)
at Function.Module._load (module.js:300:12)
at Function.Module.runMain (module.js:441:10)
at startup (node.js:134:18)
at node.js:962:3
{ name: 'cuiyanwei', age: 24, eat: [Function] }
{ DTRACE_NET_SERVER_CONNECTION: [Function],
DTRACE_NET_STREAM_END: [Function],
DTRACE_HTTP_SERVER_REQUEST: [Function],
DTRACE_HTTP_SERVER_RESPONSE: [Function],
DTRACE_HTTP_CLIENT_REQUEST: [Function],
DTRACE_HTTP_CLIENT_RESPONSE: [Function],
global: [Circular],
process:
process {
title: '/usr/local/bin/node',
version: 'v4.3.1',
moduleLoadList:
[ 'Binding contextify',
'Binding natives',
'NativeModule events',
'NativeModule buffer',
'Binding buffer',
'NativeModule internal/util',
'Binding util',
'NativeModule timers',
'Binding timer_wrap',
'NativeModule _linklist',
'NativeModule assert',
'NativeModule util',
'Binding uv',
'NativeModule path',
'NativeModule module',
'NativeModule internal/module',
'NativeModule vm',
'NativeModule fs',
'Binding fs',
'NativeModule constants',
'Binding constants',
'NativeModule stream',
'NativeModule _stream_readable',
'NativeModule _stream_writable',
'NativeModule _stream_duplex',
'NativeModule _stream_transform',
'NativeModule _stream_passthrough',
'Binding fs_event_wrap',
'NativeModule console',
'Binding tty_wrap',
'NativeModule net',
'Binding cares_wrap',
'Binding tcp_wrap',
'Binding pipe_wrap',
'Binding stream_wrap' ],
versions:
{ http_parser: '2.5.2',
node: '4.3.1',
v8: '4.5.103.35',
uv: '1.8.0',
zlib: '1.2.8',
ares: '1.10.1-DEV',
icu: '56.1',
modules: '46',
openssl: '1.0.2f' },
arch: 'x64',
platform: 'darwin',
release:
{ name: 'node',
lts: 'Argon',
sourceUrl: 'https://nodejs.org/download/release/v4.3.1/node-v4.3.1.tar.gz',
headersUrl: 'https://nodejs.org/download/release/v4.3.1/node-v4.3.1-headers.tar.gz' },
argv:
[ '/usr/local/bin/node',
'/Users/city--online/Desktop/Console/Console.js' ],
execArgv: [],
env:
{ SHELL: '/bin/bash',
TMPDIR: '/var/folders/65/m0mbnd5515v0k2bnh6pzl75w0000gn/T/',
__CF_USER_TEXT_ENCODING: '0x1F5:0x19:0x34',
PATH: '/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin',
VERSIONER_PYTHON_VERSION: '2.7',
XPC_FLAGS: '0x0',
USER: 'city--online',

HOME: '/Users/city--online',
assert.js:89
LOGNAME: 'city--online',
throw new assert.AssertionError({
XPC_SERVICE_NAME: '0',
^
Apple_PubSub_Socket_Render: '/private/tmp/com.apple.launchd.BNOh3IvDtv/Render',
AssertionError: error 2==1
SSH_AUTH_SOCK: '/private/tmp/com.apple.launchd.30OLhAehof/Listeners',
at Console.assert (console.js:87:23)
VERSIONER_PYTHON_PREFER_32_BIT: 'no' },
at Object.<anonymous> (/Users/city--online/Desktop/Console/Console.js:46:9)
pid: 5236,
at Module._compile (module.js:409:26)
features:
at Object.Module._extensions..js (module.js:416:10)
{ debug: false,
at Module.load (module.js:343:32)
uv: true,
at Function.Module._load (module.js:300:12)
ipv6: true,
at Function.Module.runMain (module.js:441:10)
tls_npn: true,
at startup (node.js:134:18)
tls_sni: true,
at node.js:962:3
tls_ocsp: true,
tls: true },
_needImmediateCallback: false,
execPath: '/usr/local/bin/node',
debugPort: 5858,
_startProfilerIdleNotifier: [Function: _startProfilerIdleNotifier],
_stopProfilerIdleNotifier: [Function: _stopProfilerIdleNotifier],
_getActiveRequests: [Function: _getActiveRequests],
_getActiveHandles: [Function: _getActiveHandles],
reallyExit: [Function: reallyExit],
abort: [Function: abort],
chdir: [Function: chdir],
cwd: [Function: cwd],
umask: [Function: umask],
getuid: [Function: getuid],
geteuid: [Function: geteuid],
setuid: [Function: setuid],
seteuid: [Function: seteuid],
setgid: [Function: setgid],
setegid: [Function: setegid],
getgid: [Function: getgid],
getegid: [Function: getegid],
getgroups: [Function: getgroups],
setgroups: [Function: setgroups],
initgroups: [Function: initgroups],
_kill: [Function: _kill],
_debugProcess: [Function: _debugProcess],
_debugPause: [Function: _debugPause],
_debugEnd: [Function: _debugEnd],
hrtime: [Function: hrtime],
dlopen: [Function: dlopen],
uptime: [Function: uptime],
memoryUsage: [Function: memoryUsage],
binding: [Function: binding],
_linkedBinding: [Function: _linkedBinding],
_setupDomainUse: [Function: _setupDomainUse],
_events: { newListener: [Function], removeListener: [Function] },
_rawDebug: [Function],
domain: null,
_maxListeners: undefined,
EventEmitter:
{ [Function: EventEmitter]
EventEmitter: [Circular],
usingDomains: false,
defaultMaxListeners: 10,
init: [Function],
listenerCount: [Function] },
_fatalException: [Function],
_exiting: false,
assert: [Function],
config: { target_defaults: [Object], variables: [Object] },
nextTick: [Function: nextTick],
_tickCallback: [Function: _tickCallback],
_tickDomainCallback: [Function: _tickDomainCallback],
stdout: [Getter],
stderr: [Getter],
stdin: [Getter],
openStdin: [Function],
exit: [Function],
kill: [Function],
_eventsCount: NaN,
mainModule:
Module {
id: '.',
exports: {},
parent: null,
filename: '/Users/city--online/Desktop/Console/Console.js',
loaded: false,
children: [],
paths: [Object] } },
GLOBAL: [Circular],
root: [Circular],
Buffer:
{ [Function: Buffer]
poolSize: 8192,
isBuffer: [Function: isBuffer],
compare: [Function: compare],
isEncoding: [Function],
concat: [Function],
byteLength: [Function: byteLength] },
clearImmediate: [Function],
clearInterval: [Function],
clearTimeout: [Function],
setImmediate: [Function],
setInterval: [Function],
setTimeout: [Function],
console: [Getter] }

Process finished with exit code 1