012_call和apply區別

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一、

function fn(a,b) {console.log(this);}fn.call(null,1,2);           //call為參數方式fn.apply(null,[1,2]);     //apply為數組方式/*輸出=>Object [global] {  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: ‘v10.3.0‘,     versions:      { http_parser: ‘2.8.0‘,        node: ‘10.3.0‘,        v8: ‘6.6.346.32-node.9‘,        uv: ‘1.20.3‘,        zlib: ‘1.2.11‘,        ares: ‘1.14.0‘,        modules: ‘64‘,        nghttp2: ‘1.29.0‘,        napi: ‘3‘,        openssl: ‘1.1.0h‘,        icu: ‘61.1‘,        unicode: ‘10.0‘,        cldr: ‘33.0‘,        tz: ‘2018c‘ },     arch: ‘x64‘,     platform: ‘darwin‘,     release:      { name: ‘node‘,        sourceUrl:         ‘https://nodejs.org/download/release/v10.3.0/node-v10.3.0.tar.gz‘,        headersUrl:         ‘https://nodejs.org/download/release/v10.3.0/node-v10.3.0-headers.tar.gz‘ },     argv:      [ ‘/usr/local/Cellar/node/10.3.0/bin/node‘,        ‘/Users/00arunalldata00/009_mystudy/010_everest/001_Everest4/20180628/201804/7.fs/11.fn.js‘ ],     execArgv: [],     env:      { PATH:         ‘/usr/local/opt/openssl/bin:/opt/vagrant/bin:/usr/local/sbin:/usr/local/opt/sqlite/bin:/usr/local/opt/openresty-openssl/bin:/usr/local/opt/icu4c/sbin:/usr/local/mysql/bin:/usr/local/opt/icu4c/bin:/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin:/usr/local/go/bin:/Applications/Wireshark.app/Contents/MacOS‘,        NVM_RC_VERSION: ‘‘,        FORCE_COLOR: ‘true‘,        ELECTRON_NO_ATTACH_CONSOLE: ‘true‘,        DEBUG_COLORS: ‘true‘,        npm_config_color: ‘always‘,        MOCHA_COLORS: ‘1‘,        VERSIONER_PYTHON_VERSION: ‘2.7‘,        LOGNAME: ‘arunyang‘,        NVM_NODEJS_ORG_MIRROR: ‘https://nodejs.org/dist‘,        XPC_SERVICE_NAME: ‘com.jetbrains.WebStorm.77156‘,        PWD:         ‘/Users/00arunalldata00/009_mystudy/010_everest/001_Everest4/20180628/201804/7.fs‘,        NVM_CD_FLAGS: ‘-q‘,        NVM_DIR: ‘/Users/arunyang/.nvm‘,        SHELL: ‘/bin/zsh‘,        PAGER: ‘less‘,        LSCOLORS: ‘Gxfxcxdxbxegedabagacad‘,        SECURITYSESSIONID: ‘186a8‘,        OLDPWD: ‘/Applications/WebStorm.app/Contents/bin‘,        VERSIONER_PYTHON_PREFER_32_BIT: ‘no‘,        USER: ‘arunyang‘,        ZSH: ‘/Users/arunyang/.oh-my-zsh‘,        TMPDIR: ‘/var/folders/wy/v0w9vkf52836x21w_jz2wzlh0000gn/T/‘,        SSH_AUTH_SOCK: ‘/private/tmp/com.apple.launchd.IKTjc3zbdP/Listeners‘,        XPC_FLAGS: ‘0x0‘,        NVM_IOJS_ORG_MIRROR: ‘https://iojs.org/dist‘,        __CF_USER_TEXT_ENCODING: ‘0x1F5:0x0:0x0‘,        Apple_PubSub_Socket_Render: ‘/private/tmp/com.apple.launchd.huBMuc0K3M/Render‘,        LESS: ‘-R‘,        LC_CTYPE: ‘‘,        HOME: ‘/Users/arunyang‘ },     pid: 3023,     features:      { debug: false,        uv: true,        ipv6: true,        tls_alpn: true,        tls_sni: true,        tls_ocsp: true,        tls: true },     ppid: 2534,     execPath: ‘/usr/local/Cellar/node/10.3.0/bin/node‘,     debugPort: 9229,     _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],     _debugEnd: [Function: _debugEnd],     hrtime: [Function: hrtime],     cpuUsage: [Function: cpuUsage],     dlopen: [Function: dlopen],     uptime: [Function: uptime],     memoryUsage: [Function: memoryUsage],     _rawDebug: [Function],     moduleLoadList:      [ ‘Binding contextify‘,        ‘NativeModule events‘,        ‘NativeModule internal/async_hooks‘,        ‘NativeModule internal/errors‘,        ‘Binding uv‘,        ‘Binding buffer‘,        ‘Binding async_wrap‘,        ‘Binding config‘,        ‘Binding icu‘,        ‘NativeModule util‘,        ‘NativeModule internal/encoding‘,        ‘NativeModule internal/util‘,        ‘Binding constants‘,        ‘Binding util‘,        ‘NativeModule internal/util/types‘,        ‘Internal Binding types‘,        ‘NativeModule buffer‘,        ‘NativeModule internal/buffer‘,        ‘NativeModule internal/process‘,        ‘NativeModule assert‘,        ‘NativeModule internal/assert‘,        ‘NativeModule fs‘,        ‘NativeModule path‘,        ‘NativeModule internal/constants‘,        ‘Binding fs‘,        ‘NativeModule stream‘,        ‘NativeModule internal/streams/pipeline‘,        ‘NativeModule internal/streams/end-of-stream‘,        ‘NativeModule internal/streams/legacy‘,        ‘NativeModule _stream_readable‘,        ‘NativeModule internal/streams/buffer_list‘,        ‘NativeModule internal/streams/destroy‘,        ‘NativeModule internal/streams/state‘,        ‘NativeModule _stream_writable‘,        ‘NativeModule _stream_duplex‘,        ‘NativeModule _stream_transform‘,        ‘NativeModule _stream_passthrough‘,        ‘Binding fs_event_wrap‘,        ‘NativeModule internal/fs/utils‘,        ‘NativeModule internal/url‘,        ‘NativeModule internal/querystring‘,        ‘Binding url‘,        ‘NativeModule internal/process/warning‘,        ‘NativeModule internal/process/next_tick‘,        ‘NativeModule internal/process/promises‘,        ‘NativeModule internal/fixed_queue‘,        ‘NativeModule internal/process/stdio‘,        ‘Binding performance‘,        ‘Binding trace_events‘,        ‘NativeModule internal/inspector_async_hook‘,        ‘Binding inspector‘,        ‘NativeModule timers‘,        ‘Binding timer_wrap‘,        ‘NativeModule internal/linkedlist‘,        ‘NativeModule internal/timers‘,        ‘NativeModule internal/modules/cjs/loader‘,        ‘NativeModule vm‘,        ‘NativeModule internal/modules/cjs/helpers‘,        ‘NativeModule console‘,        ‘Binding tty_wrap‘,        ‘NativeModule net‘,        ‘NativeModule internal/net‘,        ‘Binding cares_wrap‘,        ‘Binding stream_wrap‘,        ‘Binding tcp_wrap‘,        ‘Binding pipe_wrap‘,        ‘NativeModule internal/stream_base_commons‘ ],     binding: [Function: binding],     _linkedBinding: [Function: _linkedBinding],     _events:      { newListener: [Function],        removeListener: [Function],        warning: [Function] },     _eventsCount: 3,     _maxListeners: undefined,     _fatalException: [Function],     domain: null,     _exiting: false,     assert: [Function: deprecated],     config: { target_defaults: [Object], variables: [Object] },     setUncaughtExceptionCaptureCallback: [Function],     hasUncaughtExceptionCaptureCallback: [Function],     emitWarning: [Function],     nextTick: [Function: nextTick],     _tickCallback: [Function: _tickCallback],     stdout: [Getter],     stderr: [Getter],     stdin: [Getter],     openStdin: [Function],     exit: [Function],     kill: [Function],     argv0: ‘/usr/local/bin/node‘,     mainModule:      Module {        id: ‘.‘,        exports: {},        parent: null,        filename:         ‘/Users/00arunalldata00/009_mystudy/010_everest/001_Everest4/20180628/201804/7.fs/11.fn.js‘,        loaded: false,        children: [],        paths: [Array] } },  Buffer:   { [Function: Buffer]     poolSize: 8192,     from: [Function: from],     of: [Function: of],     alloc: [Function: alloc],     allocUnsafe: [Function: allocUnsafe],     allocUnsafeSlow: [Function: allocUnsafeSlow],     isBuffer: [Function: isBuffer],     compare: [Function: compare],     isEncoding: [Function: isEncoding],     concat: [Function: concat],     byteLength: [Function: byteLength],     [Symbol(kIsEncodingSymbol)]: [Function: isEncoding] },  clearImmediate: [Function: clearImmediate],  clearInterval: [Function: clearInterval],  clearTimeout: [Function: clearTimeout],  setImmediate:   { [Function: setImmediate] [Symbol(util.promisify.custom)]: [Function] },  setInterval: [Function: setInterval],  setTimeout:   { [Function: setTimeout] [Symbol(util.promisify.custom)]: [Function] } }Object [global] {  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: ‘v10.3.0‘,     versions:      { http_parser: ‘2.8.0‘,        node: ‘10.3.0‘,        v8: ‘6.6.346.32-node.9‘,        uv: ‘1.20.3‘,        zlib: ‘1.2.11‘,        ares: ‘1.14.0‘,        modules: ‘64‘,        nghttp2: ‘1.29.0‘,        napi: ‘3‘,        openssl: ‘1.1.0h‘,        icu: ‘61.1‘,        unicode: ‘10.0‘,        cldr: ‘33.0‘,        tz: ‘2018c‘ },     arch: ‘x64‘,     platform: ‘darwin‘,     release:      { name: ‘node‘,        sourceUrl:         ‘https://nodejs.org/download/release/v10.3.0/node-v10.3.0.tar.gz‘,        headersUrl:         ‘https://nodejs.org/download/release/v10.3.0/node-v10.3.0-headers.tar.gz‘ },     argv:      [ ‘/usr/local/Cellar/node/10.3.0/bin/node‘,        ‘/Users/00arunalldata00/009_mystudy/010_everest/001_Everest4/20180628/201804/7.fs/11.fn.js‘ ],     execArgv: [],     env:      { PATH:         ‘/usr/local/opt/openssl/bin:/opt/vagrant/bin:/usr/local/sbin:/usr/local/opt/sqlite/bin:/usr/local/opt/openresty-openssl/bin:/usr/local/opt/icu4c/sbin:/usr/local/mysql/bin:/usr/local/opt/icu4c/bin:/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin:/usr/local/go/bin:/Applications/Wireshark.app/Contents/MacOS‘,        NVM_RC_VERSION: ‘‘,        FORCE_COLOR: ‘true‘,        ELECTRON_NO_ATTACH_CONSOLE: ‘true‘,        DEBUG_COLORS: ‘true‘,        npm_config_color: ‘always‘,        MOCHA_COLORS: ‘1‘,        VERSIONER_PYTHON_VERSION: ‘2.7‘,        LOGNAME: ‘arunyang‘,        NVM_NODEJS_ORG_MIRROR: ‘https://nodejs.org/dist‘,        XPC_SERVICE_NAME: ‘com.jetbrains.WebStorm.77156‘,        PWD:         ‘/Users/00arunalldata00/009_mystudy/010_everest/001_Everest4/20180628/201804/7.fs‘,        NVM_CD_FLAGS: ‘-q‘,        NVM_DIR: ‘/Users/arunyang/.nvm‘,        SHELL: ‘/bin/zsh‘,        PAGER: ‘less‘,        LSCOLORS: ‘Gxfxcxdxbxegedabagacad‘,        SECURITYSESSIONID: ‘186a8‘,        OLDPWD: ‘/Applications/WebStorm.app/Contents/bin‘,        VERSIONER_PYTHON_PREFER_32_BIT: ‘no‘,        USER: ‘arunyang‘,        ZSH: ‘/Users/arunyang/.oh-my-zsh‘,        TMPDIR: ‘/var/folders/wy/v0w9vkf52836x21w_jz2wzlh0000gn/T/‘,        SSH_AUTH_SOCK: ‘/private/tmp/com.apple.launchd.IKTjc3zbdP/Listeners‘,        XPC_FLAGS: ‘0x0‘,        NVM_IOJS_ORG_MIRROR: ‘https://iojs.org/dist‘,        __CF_USER_TEXT_ENCODING: ‘0x1F5:0x0:0x0‘,        Apple_PubSub_Socket_Render: ‘/private/tmp/com.apple.launchd.huBMuc0K3M/Render‘,        LESS: ‘-R‘,        LC_CTYPE: ‘‘,        HOME: ‘/Users/arunyang‘ },     pid: 3023,     features:      { debug: false,        uv: true,        ipv6: true,        tls_alpn: true,        tls_sni: true,        tls_ocsp: true,        tls: true },     ppid: 2534,     execPath: ‘/usr/local/Cellar/node/10.3.0/bin/node‘,     debugPort: 9229,     _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],     _debugEnd: [Function: _debugEnd],     hrtime: [Function: hrtime],     cpuUsage: [Function: cpuUsage],     dlopen: [Function: dlopen],     uptime: [Function: uptime],     memoryUsage: [Function: memoryUsage],     _rawDebug: [Function],     moduleLoadList:      [ ‘Binding contextify‘,        ‘NativeModule events‘,        ‘NativeModule internal/async_hooks‘,        ‘NativeModule internal/errors‘,        ‘Binding uv‘,        ‘Binding buffer‘,        ‘Binding async_wrap‘,        ‘Binding config‘,        ‘Binding icu‘,        ‘NativeModule util‘,        ‘NativeModule internal/encoding‘,        ‘NativeModule internal/util‘,        ‘Binding constants‘,        ‘Binding util‘,        ‘NativeModule internal/util/types‘,        ‘Internal Binding types‘,        ‘NativeModule buffer‘,        ‘NativeModule internal/buffer‘,        ‘NativeModule internal/process‘,        ‘NativeModule assert‘,        ‘NativeModule internal/assert‘,        ‘NativeModule fs‘,        ‘NativeModule path‘,        ‘NativeModule internal/constants‘,        ‘Binding fs‘,        ‘NativeModule stream‘,        ‘NativeModule internal/streams/pipeline‘,        ‘NativeModule internal/streams/end-of-stream‘,        ‘NativeModule internal/streams/legacy‘,        ‘NativeModule _stream_readable‘,        ‘NativeModule internal/streams/buffer_list‘,        ‘NativeModule internal/streams/destroy‘,        ‘NativeModule internal/streams/state‘,        ‘NativeModule _stream_writable‘,        ‘NativeModule _stream_duplex‘,        ‘NativeModule _stream_transform‘,        ‘NativeModule _stream_passthrough‘,        ‘Binding fs_event_wrap‘,        ‘NativeModule internal/fs/utils‘,        ‘NativeModule internal/url‘,        ‘NativeModule internal/querystring‘,        ‘Binding url‘,        ‘NativeModule internal/process/warning‘,        ‘NativeModule internal/process/next_tick‘,        ‘NativeModule internal/process/promises‘,        ‘NativeModule internal/fixed_queue‘,        ‘NativeModule internal/process/stdio‘,        ‘Binding performance‘,        ‘Binding trace_events‘,        ‘NativeModule internal/inspector_async_hook‘,        ‘Binding inspector‘,        ‘NativeModule timers‘,        ‘Binding timer_wrap‘,        ‘NativeModule internal/linkedlist‘,        ‘NativeModule internal/timers‘,        ‘NativeModule internal/modules/cjs/loader‘,        ‘NativeModule vm‘,        ‘NativeModule internal/modules/cjs/helpers‘,        ‘NativeModule console‘,        ‘Binding tty_wrap‘,        ‘NativeModule net‘,        ‘NativeModule internal/net‘,        ‘Binding cares_wrap‘,        ‘Binding stream_wrap‘,        ‘Binding tcp_wrap‘,        ‘Binding pipe_wrap‘,        ‘NativeModule internal/stream_base_commons‘ ],     binding: [Function: binding],     _linkedBinding: [Function: _linkedBinding],     _events:      { newListener: [Function],        removeListener: [Function],        warning: [Function] },     _eventsCount: 3,     _maxListeners: undefined,     _fatalException: [Function],     domain: null,     _exiting: false,     assert: [Function: deprecated],     config: { target_defaults: [Object], variables: [Object] },     setUncaughtExceptionCaptureCallback: [Function],     hasUncaughtExceptionCaptureCallback: [Function],     emitWarning: [Function],     nextTick: [Function: nextTick],     _tickCallback: [Function: _tickCallback],     stdout: [Getter],     stderr: [Getter],     stdin: [Getter],     openStdin: [Function],     exit: [Function],     kill: [Function],     argv0: ‘/usr/local/bin/node‘,     mainModule:      Module {        id: ‘.‘,        exports: {},        parent: null,        filename:         ‘/Users/00arunalldata00/009_mystudy/010_everest/001_Everest4/20180628/201804/7.fs/11.fn.js‘,        loaded: false,        children: [],        paths: [Array] } },  Buffer:   { [Function: Buffer]     poolSize: 8192,     from: [Function: from],     of: [Function: of],     alloc: [Function: alloc],     allocUnsafe: [Function: allocUnsafe],     allocUnsafeSlow: [Function: allocUnsafeSlow],     isBuffer: [Function: isBuffer],     compare: [Function: compare],     isEncoding: [Function: isEncoding],     concat: [Function: concat],     byteLength: [Function: byteLength],     [Symbol(kIsEncodingSymbol)]: [Function: isEncoding] },  clearImmediate: [Function: clearImmediate],  clearInterval: [Function: clearInterval],  clearTimeout: [Function: clearTimeout],  setImmediate:   { [Function: setImmediate] [Symbol(util.promisify.custom)]: [Function] },  setInterval: [Function: setInterval],  setTimeout:   { [Function: setTimeout] [Symbol(util.promisify.custom)]: [Function] } }*/

　　

012_call和apply區別