一、node运行环境

1、npm install -g n  

通过npm 全局安装node

2、sudo n 8.16.0 

设置node版本

Password:

install : node-v8.16.0

mkdir : /usr/local/n/versions/node/8.16.0

fetch : https://nodejs.org/dist/v8.16.0/node-v8.16.0-darwin-x64.tar.gz

######################################################################## 100.0%

installed : v8.16.0

3、node -v

v8.16.0

二、安装mongodb

1、brew tap mongodb/brew

2、brew install mongodb-community

=> Installing mongodb-community from mongodb/brew
==> Downloading https://fastdl.mongodb.org/osx/mongodb-macos-x86_64-4.2.5.tgz
######################################################################## 100.0%
==> Caveats
To have launchd start mongodb/brew/mongodb-community now and restart at login:
brew services start mongodb/brew/mongodb-community
Or, if you don't want/need a background service you can just run:
mongod --config /usr/local/etc/mongod.conf
==> Summary
????  /usr/local/Cellar/mongodb-community/4.2.5: 21 files, 305.9MB, built in 7 minutes 4 seconds
(base) mengfaniaodeMBP:homebrew-core mengfanxiao$ cat usr/local/etc/mongod.conf
cat: usr/local/etc/mongod.conf: No such file or directory
(base) mengfaniaodeMBP:homebrew-core mengfanxiao$ brew services start mongodb/brew/mongodb-community
==> Successfully started `mongodb-community` (label: homebrew.mxcl.mongodb-community)

3、启动/停止

brew services start mongodb-community

brew services stop mongodb-community

4、配置

配置文件：/usr/local/etc/mongod.conf

日志目录路径：/usr/local/var/log/mongodb

数据目录路径：/usr/local/var/mongodb

5、端口

三、问题梳理

1、环境问题

node -v

dyld: Library not loaded:

/usr/local/opt/icu4c/lib/libicui18n.64.dylib

Referenced from: /usr/local/bin/node

Reason: image not found

Abort trap: 6

说明node相关库已被损坏 需要重新安装

卸载node 

brew uninstall --ignore-dependencies node icu4c

Uninstalling /usr/local/Cellar/node/13.5.0... (4,663 files, 59.1MB)

node 12.12.0 is still installed.

Run `brew uninstall --force node` to remove all versions.

安装node

brew install node 

通过这种方式安装的是最新版本的node 但很容易出现版本不兼容问题 所以不推荐这么安装 建议安装node8 该版本比较稳定 很少出现与其他软件不兼容情况 

2、文件创建权限问题

==> Installing dependencies for node: icu4c
==> Installing node dependency: icu4c
==> Downloading https://mirrors.aliyun.com/homebrew/homebrew-bottles/bottles/icu4c-64.2.mojave.bottle.tar.gz
######################################################################## 100.0%
==> Pouring icu4c-64.2.mojave.bottle.tar.gz
Error: Failed to create /usr/local/opt/icu4c
Things that depend on icu4c will probably not build.
Could not symlink .
/usr/local/opt is not writable.
==> Caveats

a、创建文件夹

sudo mkdir  /usr/local/opt

 b、root用户赋予当前用户操作该文件夹权限

此时该文件夹权限属于root 给mengfanxiao账户赋予权限

chown -R mengfanxiao /usr/local/opt

3、插曲 springboot启动问题 

dea启动spring-boot,报java.lang.NoClassDefFoundError: javax/servlet/ServletContext错误

<dependency>

<groupId>org.springframework.boot</groupId>

<artifactId>spring-boot-starter-tomcat</artifactId>

<scope>provided</scope>

</dependency>

把scope注释掉即可

maven中三种classpath

编译，测试，运行

1.compile：默认范围，编译测试运行都有效

2.provided：在编译和测试时有效

3.runtime：在测试和运行时有效

4.test:只在测试时有效

5.system:在编译和测试时有效，与本机系统关联，可移植性差

4、环境不匹配问题

Node Sass does not yet support your current environment: OS X 64-bit with Unsupported runtime (79)qi

卸载重装（最新版本的node-sass）即可：

npm uninstall node-sass -D

npm install node-sass -D

5、版本冲突问题 node和mongodb版本不兼容

mongodb-core@1.2.31 requires a peer of kerberos@~0.0

node -v   v13.12.0

npm -v   6.14.4

gyp ERR! command "/usr/local/Cellar/node/13.12.0/bin/node" "/usr/local/lib/node_modules/npm/node_modules/node-gyp/bin/node-gyp.js" "rebuild" gyp ERR! cwd /Users/mengfanxiao/Documents/project/company/wechain/questionnaire/node_modules/leveldown

gyp ERR! node -v v13.12.0

gyp ERR! node-gyp -v v5.1.0

gyp ERR! not ok

npm WARN mongodb-core@1.2.31 requires a peer of kerberos@~0.0 but none is installed. You must install peer dependencies yourself.

这种情况需要安装node8

brew search node

==> Formulae

libbitcoin-node     node                node-sass           node@12             nodebrew            nodenv

llnode              node-build          node@10             node_exporter ✔     nodeenv

如果有node8 

则 brew install node@8

然后brew link --overwrite --force node@8

没有node8 

npm install -g n

sudo n 8.16.0

安装了node8版本

npm install

> leveldown@1.7.2 install /Users/mengfanxiao/Documents/project/company/wechain/new/questionnaire/node_modules/level/node_modules/leveldown

> prebuild-install || node-gyp rebuild

added 42 packages from 44 contributors in 20.79s

6、安装mongodb问题

brew install mongodb

Error: No available formula with the name 'mongodb'

MongoDB不再是开源的了，并且已经从Homebrew中移除 #43770

安装MongoDB社区服务器的最新可用生产版本（包括所有命令行工具）。这将安装MongoDB 4.2.x：

$ brew install mongodb-community

安装MongoDB社区服务器和命令行工具的最新4.2.x生产版本：

$ brew install mongodb-community@4.2

安装MongoDB社区服务器和命令行工具的最新4.0.x生产版本：

$ brew install mongodb-community@4.0

安装MongoDB社区服务器和命令行工具的最新3.6.x生产版本：

$ brew install mongodb-community@3.6

仅安装最新的mongoshell以连接到远程MongoDB实例：

$ brew install mongodb-community-shell