? ? ? ?最近發(fā)現(xiàn)市場上對React Native開發(fā)人員的需求挺多的脯丝，自己就想學(xué)習(xí)一下React Native宠进，多一門技術(shù)砰苍，好將來買個好價位赚导。嘿嘿！
? ? ? ?在學(xué)習(xí)React Native中碰到了不少坑圈暗，再次記錄下來以備自己以后查閱员串，當(dāng)然了寸齐，也會持續(xù)更新扰法。
? ? ? ? 只寫學(xué)習(xí)中碰到的問題塞颁。至于安裝請移步：搭建開發(fā)環(huán)境祠锣，我安裝的是React Native0.44
本人使用的是Ubuntu16.04操作系統(tǒng)锤岸，按上面鏈接中的安裝教程安裝的，安裝過程挺順利的蛋铆。沒有碰到什么棘手的問題放接。但是安裝成功后玛瘸，創(chuàng)建項目運行是出問題了糊渊。
1.error calling appregistry.run application
按教程渺绒，cd到目錄下宗兼，運行：react-nativerun-android殷绍，但是運行效果手機一片紅篡帕，如下：
原因：是沒有啟動服務(wù)器端镰烧。
答：在Android手機測試之前，要 ? 一定要先
啟動JS服務(wù)器端结执，執(zhí)行命令：
react-native start
命令執(zhí)行結(jié)果：
上面的問題就解決了献幔。
2.This warning is caused by a @providesModule declaration with the same name across two different files
運行react-native start 開始服務(wù)器蜡感，報一下錯誤。
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
解決方案來自：https://medium.com/@jeanjacquesbagui/react-native-providesmodule-naming-collision-error-6bc090925fb3
3.import React, { Component } from 'react';
SyntaxError: Unexpected token import
WebStorm運行react native代碼時 報如下錯誤：
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：沒有對WebStorm運行React Native進行配置览效。
解決：需要對WebStorm進行配置后锤灿，才能運行React Native衡招，參考：http://www.cnblogs.com/shaoting/p/6110202.html
4.Error running RunR: Please specify npm or yarn package
原因：沒有配置npm或者yarn的路徑州刽，
5.ERROR? A non-recoverable condition has triggered.? Watchman needs your help!
終端運行：react-native start 報的錯穗椅，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：因為inotify默認內(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**(這個是系統(tǒng)默認值到兩倍袍镀，夠用了)绸吸，:wq保存
然后運行/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這個文件（切勿直接修改這個文件设江，因為即使你修改了當(dāng)時生效叉存，等你重啟電腦歼捏，這個值又會恢復(fù)默認）甫菠。
好了拂苹，再運行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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'LC_PAPER=zh_CN.UTF-8',
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'XDG_GREETER_DATA_DIR=/var/lib/lightdm-data/yaoyongchao',
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'SESSION=ubuntu',
'GPG_AGENT_INFO=/home/yaoyongchao/.gnupg/S.gpg-agent:0:1',
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'QT_ACCESSIBILITY=1',
'LC_TELEPHONE=zh_CN.UTF-8',
'XDG_SESSION_PATH=/org/freedesktop/DisplayManager/Session0',
'XDG_SEAT_PATH=/org/freedesktop/DisplayManager/Seat0',
'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',
'XMODIFIERS=@im=fcitx',
'JAVA_HOME=/opt/java/jdk1.8.0_144',
'LANG=zh_CN.UTF-8',
'GNOME_KEYRING_PID=',
'GDM_LANG=zh_CN',
'MANDATORY_PATH=/usr/share/gconf/ubuntu.mandatory.path',
'LC_MEASUREMENT=zh_CN.UTF-8',
'COMPIZ_CONFIG_PROFILE=ubuntu',
'IM_CONFIG_PHASE=1',
'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' ] },
envPairs:
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'LC_PAPER=zh_CN.UTF-8',
'LC_ADDRESS=zh_CN.UTF-8',
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'XDG_SESSION_ID=c2',
'XDG_GREETER_DATA_DIR=/var/lib/lightdm-data/yaoyongchao',
'LC_MONETARY=zh_CN.UTF-8',
'CLUTTER_IM_MODULE=xim',
'SESSION=ubuntu',
'GPG_AGENT_INFO=/home/yaoyongchao/.gnupg/S.gpg-agent:0:1',
'ANDROID_HOME=/opt/java/android-sdk-linux',
'TERM=xterm-256color',
'VTE_VERSION=4205',
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'GTK_MODULES=gail:atk-bridge:unity-gtk-module',
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'QT_ACCESSIBILITY=1',
'LC_TELEPHONE=zh_CN.UTF-8',
'XDG_SESSION_PATH=/org/freedesktop/DisplayManager/Session0',
'XDG_SEAT_PATH=/org/freedesktop/DisplayManager/Seat0',
'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',
'XMODIFIERS=@im=fcitx',
'JAVA_HOME=/opt/java/jdk1.8.0_144',
'LANG=zh_CN.UTF-8',
'GNOME_KEYRING_PID=',
'GDM_LANG=zh_CN',
'MANDATORY_PATH=/usr/share/gconf/ubuntu.mandatory.path',
'LC_MEASUREMENT=zh_CN.UTF-8',
'COMPIZ_CONFIG_PROFILE=ubuntu',
'IM_CONFIG_PHASE=1',
'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)日志跺撼，升級node到最新的版本歉井，問題解決哩至。
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
