? ? ? ?最近發(fā)現(xiàn)市場(chǎng)上對(duì)React Native開(kāi)發(fā)人員的需求挺多的，自己就想學(xué)習(xí)一下React Native，多一門(mén)技術(shù)，好將來(lái)買(mǎi)個(gè)好價(jià)位。嘿嘿！
? ? ? ?在學(xué)習(xí)React Native中碰到了不少坑，再次記錄下來(lái)以備自己以后查閱，當(dāng)然了，也會(huì)持續(xù)更新。
? ? ? ? 只寫(xiě)學(xué)習(xí)中碰到的問(wèn)題。至于安裝請(qǐng)移步：搭建開(kāi)發(fā)環(huán)境，我安裝的是React Native0.44
本人使用的是Ubuntu16.04操作系統(tǒng)，按上面鏈接中的安裝教程安裝的，安裝過(guò)程挺順利的。沒(méi)有碰到什么棘手的問(wèn)題。但是安裝成功后，創(chuàng)建項(xiàng)目運(yùn)行是出問(wèn)題了。
1.error calling appregistry.run application
按教程，cd到目錄下，運(yùn)行：react-nativerun-android，但是運(yùn)行效果手機(jī)一片紅，如下：
原因：是沒(méi)有啟動(dòng)服務(wù)器端。
答：在Android手機(jī)測(cè)試之前，要 ? 一定要先
啟動(dòng)JS服務(wù)器端，執(zhí)行命令：
react-native start
命令執(zhí)行結(jié)果：
上面的問(wèn)題就解決了。
2.This warning is caused by a @providesModule declaration with the same name across two different files
運(yùn)行react-native start 開(kāi)始服務(wù)器，報(bào)一下錯(cuò)誤。
This warning is caused by a @providesModule declaration with the same name across two different files.jest-haste-map: @providesModule naming collision:? Duplicate module name: bser? Paths: /home/yaoyongchao/Ab/node_modules/react-native/node_modules/bser/package.json collides with /home/yaoyongchao/Ab/node_modules/react-native/node_modules/jest-haste-map/node_modules/bser/package.jsonThis warning is caused by a @providesModule declaration with the same name across two different files. ERROR? A non-recoverable condition has triggered.? Watchman needs your help!The triggering condition was at timestamp=1494859938: inotify-add-watch(/home/yaoyongchao/YouDemo/node_modules/fbjs/node_modules/core-js/library/fn/number) -> The user limit on the total number of inotify watches was reached; increase the fs.inotify.max_user_watches sysctlAll requests will continue to fail with this message until you resolvethe underlying problem.? You will find more information on fixing this athttps://facebook.github.io/watchman/docs/troubleshooting.html#poison-inotify-add-watch{"watchmanResponse":{"version":"4.7.0","error":"A non-recoverable condition has triggered.? Watchman needs your help!\nThe triggering condition was at timestamp=1494859938: inotify-add-watch(/home/yaoyongchao/YouDemo/node_modules/fbjs/node_modules/core-js/library/fn/number) -> The user limit on the total number of inotify watches was reached; increase the fs.inotify.max_user_watches sysctl\nAll requests will continue to fail with this message until you resolve\nthe underlying problem.? You will find more information on fixing this at\nhttps://facebook.github.io/watchman/docs/troubleshooting.html#poison-inotify-add-watch\n"}}Error: A non-recoverable condition has triggered.? Watchman needs your help!The triggering condition was at timestamp=1494859938: inotify-add-watch(/home/yaoyongchao/YouDemo/node_modules/fbjs/node_modules/core-js/library/fn/number) -> The user limit on the total number of inotify watches was reached; increase the fs.inotify.max_user_watches sysctlAll requests will continue to fail with this message until you resolvethe underlying problem.? You will find more information on fixing this athttps://facebook.github.io/watchman/docs/troubleshooting.html#poison-inotify-add-watch? ? at ChildProcess.(/home/yaoyongchao/Ab/node_modules/react-native/node_modules/jest-haste-map/node_modules/sane/node_modules/fb-watchman/index.js:207:21)? ? at emitTwo (events.js:106:13)? ? at ChildProcess.emit (events.js:191:7)? ? at maybeClose (internal/child_process.js:886:16)? ? at Socket.(internal/child_process.js:342:11)
at emitOne (events.js:96:13)
at Socket.emit (events.js:188:7)
at Pipe._handle.close [as _onclose] (net.js:497:12)
解決：watchman watch-del-all
rm -rf node_modules && npm install
rm -fr $TMPDIR/react-*
npm cache clean
npm start -- --reset-cache
解決方案來(lái)自：https://medium.com/@jeanjacquesbagui/react-native-providesmodule-naming-collision-error-6bc090925fb3
3.import React, { Component } from 'react';
SyntaxError: Unexpected token import
WebStorm運(yùn)行react native代碼時(shí) 報(bào)如下錯(cuò)誤：
import React, { Component } from 'react';
SyntaxError: Unexpected token import
at createScript (vm.js:56:10)
at Object.runInThisContext (vm.js:97:10)
at Module._compile (module.js:542:28)
at Object.Module._extensions..js (module.js:579:10)
at Module.load (module.js:487:32)
at tryModuleLoad (module.js:446:12)
at Function.Module._load (module.js:438:3)
at Module.runMain (module.js:604:10)
at run (bootstrap_node.js:390:7)
at startup (bootstrap_node.js:150:9)
原因：沒(méi)有對(duì)WebStorm運(yùn)行React Native進(jìn)行配置。
解決：需要對(duì)WebStorm進(jìn)行配置后，才能運(yùn)行React Native，參考：http://www.cnblogs.com/shaoting/p/6110202.html
4.Error running RunR: Please specify npm or yarn package
原因：沒(méi)有配置npm或者yarn的路徑，
5.ERROR? A non-recoverable condition has triggered.? Watchman needs your help!
終端運(yùn)行：react-native start 報(bào)的錯(cuò)，如下：
ERROR? A non-recoverable condition has triggered.? Watchman needs your help!The triggering condition was at timestamp=1498047338: inotify-add-watch(/home/yaoyongchao/YouDemo/android/app/build/intermediates/transforms/mergeJniLibs/debug/folders/2000/1f/main/lib/arm64-v8a) -> The user limit on the total number of inotify watches was reached; increase the fs.inotify.max_user_watches sysctlAll requests will continue to fail with this message until you resolvethe underlying problem.? You will find more information on fixing this athttps://facebook.github.io/watchman/docs/troubleshooting.html#poison-inotify-add-watch{"watchmanResponse":{"version":"4.7.0","error":"A non-recoverable condition has triggered.? Watchman needs your help!\nThe triggering condition was at timestamp=1498047338: inotify-add-watch(/home/yaoyongchao/YouDemo/android/app/build/intermediates/transforms/mergeJniLibs/debug/folders/2000/1f/main/lib/arm64-v8a) -> The user limit on the total number of inotify watches was reached; increase the fs.inotify.max_user_watches sysctl\nAll requests will continue to fail with this message until you resolve\nthe underlying problem.? You will find more information on fixing this at\nhttps://facebook.github.io/watchman/docs/troubleshooting.html#poison-inotify-add-watch\n"}}Error: A non-recoverable condition has triggered.? Watchman needs your help!The triggering condition was at timestamp=1498047338: inotify-add-watch(/home/yaoyongchao/YouDemo/android/app/build/intermediates/transforms/mergeJniLibs/debug/folders/2000/1f/main/lib/arm64-v8a) -> The user limit on the total number of inotify watches was reached; increase the fs.inotify.max_user_watches sysctlAll requests will continue to fail with this message until you resolvethe underlying problem.? You will find more information on fixing this athttps://facebook.github.io/watchman/docs/troubleshooting.html#poison-inotify-add-watch? ? at ChildProcess.(/home/yaoyongchao/YouDemo/node_modules/react-native/node_modules/jest-haste-map/node_modules/sane/node_modules/fb-watchman/index.js:207:21)? ? at emitTwo (events.js:106:13)? ? at ChildProcess.emit (events.js:191:7)? ? at maybeClose (internal/child_process.js:886:16)? ? at Socket.(internal/child_process.js:342:11)
at emitOne (events.js:96:13)
at Socket.emit (events.js:188:7)
at Pipe._handle.close [as _onclose] (net.js:497:12)
原因：因?yàn)閕notify默認(rèn)內(nèi)核參數(shù)值太小。
解決：
方案一
$ sudo sysctl fs.inotify.max_user_watches=524288
$ watchman shutdown-server
方案二
sudo su?
vim /etc/sysctl.conf
在文件里面添加**fs.inotify.max_user_watches=16384**(這個(gè)是系統(tǒng)默認(rèn)值到兩倍，夠用了)，:wq保存
然后運(yùn)行/sbin/sysctl -p使其立即生效
使用sysclt -a可以看到fs.inotify.max_user_watches = 16384
或者直接查看/proc/sys/fs/inotify/max_user_watches這個(gè)文件（切勿直接修改這個(gè)文件，因?yàn)榧词鼓阈薷牧水?dāng)時(shí)生效，等你重啟電腦，這個(gè)值又會(huì)恢復(fù)默認(rèn)）。
好了，再運(yùn)行react-native start就OK了
6.Command `yarn add react-native --exact` failed.
This will walk you through creating a new React Native project in /home/yaoyongchao/ws/rn/raa
Using yarn v0.27.5
Installing react-native...
yarn add v0.27.5
info No lockfile found.
[1/4] Resolving packages...
warning react-native > connect@2.30.2: connect 2.x series is deprecated
[2/4] Fetching packages...
warning fsevents@1.1.2: The platform "linux" is incompatible with this module.
info "fsevents@1.1.2" is an optional dependency and failed compatibility check. Excluding it from installation.
error hawk@6.0.2: The engine "node" is incompatible with this module. Expected version ">=4.5.0".
error Found incompatible module
info Visit https://yarnpkg.com/en/docs/cli/add for documentation about this command.
{ [Error: Command failed: yarn add react-native --exact]
error: null,
cmd: 'yarn add react-native --exact',
file: '/bin/sh',
args: [ '/bin/sh', '-c', 'yarn add react-native --exact' ],
options:
{ stdio: [ [Object], [Object], [Object] ],
file: '/bin/sh',
args: [ '/bin/sh', '-c', 'yarn add react-native --exact' ],
envPairs:
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'SESSION=ubuntu',
'GPG_AGENT_INFO=/home/yaoyongchao/.gnupg/S.gpg-agent:0:1',
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'QT_ACCESSIBILITY=1',
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'SSH_AUTH_SOCK=/run/user/1000/keyring/ssh',
'SESSION_MANAGER=local/yaoyongchao:@/tmp/.ICE-unix/1482,unix/yaoyongchao:/tmp/.ICE-unix/1482',
'DEFAULTS_PATH=/usr/share/gconf/ubuntu.default.path',
'XDG_CONFIG_DIRS=/etc/xdg/xdg-ubuntu:/usr/share/upstart/xdg:/etc/xdg',
'DESKTOP_SESSION=ubuntu',
'PATH=/home/yaoyongchao/bin:/home/yaoyongchao/.local/bin:/opt/ide/android-studio/bin:/opt/java/android-sdk-linux/tools:/opt/java/android-sdk-linux/platform-tools:/opt/java/jdk1.8.0_144/bin:/opt/java/jdk1.8.0_144/jre/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/snap/bin',
'QT_IM_MODULE=fcitx',
'QT_QPA_PLATFORMTHEME=appmenu-qt5',
'LC_IDENTIFICATION=zh_CN.UTF-8',
'XDG_SESSION_TYPE=x11',
'PWD=/home/yaoyongchao/ws/rn',
'JOB=dbus',
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'SESSIONTYPE=gnome-session',
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'SHLVL=1',
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'XDG_SEAT=seat0',
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'GNOME_DESKTOP_SESSION_ID=this-is-deprecated',
'XDG_SESSION_DESKTOP=ubuntu',
'LOGNAME=yaoyongchao',
'DBUS_SESSION_BUS_ADDRESS=unix:abstract=/tmp/dbus-Az44WlzhBc',
'XDG_DATA_DIRS=/usr/share/ubuntu:/usr/share/gnome:/usr/local/share/:/usr/share/:/var/lib/snapd/desktop',
'CLASSPATH=.:/opt/java/jdk1.8.0_144/lib:/opt/java/jdk1.8.0_144/jre/lib:',
'QT4_IM_MODULE=fcitx',
'LESSOPEN=| /usr/bin/lesspipe %s',
'INSTANCE=',
'XDG_RUNTIME_DIR=/run/user/1000',
'DISPLAY=:0',
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'GTK_IM_MODULE=fcitx',
'LESSCLOSE=/usr/bin/lesspipe %s %s',
'LC_TIME=zh_CN.UTF-8',
'LC_NAME=zh_CN.UTF-8',
'XAUTHORITY=/home/yaoyongchao/.Xauthority',
'_=/usr/local/bin/react-native' ] },
envPairs:
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'SESSION_MANAGER=local/yaoyongchao:@/tmp/.ICE-unix/1482,unix/yaoyongchao:/tmp/.ICE-unix/1482',
'DEFAULTS_PATH=/usr/share/gconf/ubuntu.default.path',
'XDG_CONFIG_DIRS=/etc/xdg/xdg-ubuntu:/usr/share/upstart/xdg:/etc/xdg',
'DESKTOP_SESSION=ubuntu',
'PATH=/home/yaoyongchao/bin:/home/yaoyongchao/.local/bin:/opt/ide/android-studio/bin:/opt/java/android-sdk-linux/tools:/opt/java/android-sdk-linux/platform-tools:/opt/java/jdk1.8.0_144/bin:/opt/java/jdk1.8.0_144/jre/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/snap/bin',
'QT_IM_MODULE=fcitx',
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'LC_IDENTIFICATION=zh_CN.UTF-8',
'XDG_SESSION_TYPE=x11',
'PWD=/home/yaoyongchao/ws/rn',
'JOB=dbus',
'XMODIFIERS=@im=fcitx',
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'LANG=zh_CN.UTF-8',
'GNOME_KEYRING_PID=',
'GDM_LANG=zh_CN',
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'COMPIZ_CONFIG_PROFILE=ubuntu',
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'GDMSESSION=ubuntu',
'SESSIONTYPE=gnome-session',
'GTK2_MODULES=overlay-scrollbar',
'SHLVL=1',
'HOME=/home/yaoyongchao',
'XDG_SEAT=seat0',
'LANGUAGE=zh_CN:zh:en_US:en',
'GNOME_DESKTOP_SESSION_ID=this-is-deprecated',
'XDG_SESSION_DESKTOP=ubuntu',
'LOGNAME=yaoyongchao',
'DBUS_SESSION_BUS_ADDRESS=unix:abstract=/tmp/dbus-Az44WlzhBc',
'XDG_DATA_DIRS=/usr/share/ubuntu:/usr/share/gnome:/usr/local/share/:/usr/share/:/var/lib/snapd/desktop',
'CLASSPATH=.:/opt/java/jdk1.8.0_144/lib:/opt/java/jdk1.8.0_144/jre/lib:',
'QT4_IM_MODULE=fcitx',
'LESSOPEN=| /usr/bin/lesspipe %s',
'INSTANCE=',
'XDG_RUNTIME_DIR=/run/user/1000',
'DISPLAY=:0',
'XDG_CURRENT_DESKTOP=Unity',
'GTK_IM_MODULE=fcitx',
'LESSCLOSE=/usr/bin/lesspipe %s %s',
'LC_TIME=zh_CN.UTF-8',
'LC_NAME=zh_CN.UTF-8',
'XAUTHORITY=/home/yaoyongchao/.Xauthority',
'_=/usr/local/bin/react-native' ],
stderr: null,
stdout: null,
pid: 3919,
output: [ null, null, null ],
signal: null,
status: 1 }
Command `yarn add react-native --exact` failed.
解決方案：根據(jù)日志，升級(jí)node到最新的版本，問(wèn)題解決。
7.ERROR A non-recoverable condition has triggered.
ERROR A non-recoverable condition has triggered. Watchman needs your help!
The triggering condition was at timestamp=1514253347: inotify-add-watch(/home/andy/ws/rn/ODemo) -> The user limit on the total number of inotify watches was reached; increase the fs.inotify.max_user_watches sysctl
All requests will continue to fail with this message until you resolve
the underlying problem.? You will find more information on fixing this at
https://facebook.github.io/watchman/docs/troubleshooting.html#poison-inotify-add-watch
解決方法：終端輸入如下：
echo 32768 | sudo tee -a /proc/sys/fs/inotify/max_queued_events
echo 65536 | sudo tee -a /proc/sys/fs/inotify/max_user_watches
watchman shutdown-server
