D:\dev>cd npm-test
D:\dev\npm-test>npm init
This utility will walk you through creating a package.json file.
It only covers the most common items, and tries to guess sensible defaults.
See `npm help json` for definitive documentation on these fields
and exactly what they do.
Use `npm install ` afterwards to install a package and
save it as a dependency in the package.json file.
Press ^C at any time to quit.
package name: (npm-test)
version: (1.0.0)
description:
entry point: (index.js)
test command:
git repository:
keywords:
author:
license: (ISC)
About to write to D:\dev\npm-test\package.json:
{
"name": "npm-test",
"version": "1.0.0",
"description": "",
"main": "index.js",
"scripts": {
"test": "echo \"Error: no test specified\" && exit 1"
},
"author": "",
"license": "ISC"
}
Is this ok? (yes)
D:\dev\npm-test>
其中scripts的配置里面有一个test字段，当我们在命令行输入npm run test会输出echo "Error: no test specified" && exit 1
D:\dev\npm-test>npm run test
> [email protected] test D:\dev\npm-test
> echo "Error: no test specified" && exit 1
"Error: no test specified"
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! [email protected] test: `echo "Error: no test specified" && exit 1`
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the [email protected] test script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.
npm WARN Local package.json exists, but node_modules missing, did you mean to install?
npm ERR! A complete log of this run can be found in:
npm ERR! C:\Users\wxqdoit\AppData\Roaming\npm-cache\_logs\2019-02-26T06_46_24_718Z-debug.log
D:\dev\npm-test>
:: Created by npm, please don't edit manually.
//关闭回显
@ECHO OFF
//本地化
SETLOCAL
//%~dp0代表当前位置
SET "NODE_EXE=%~dp0\node.exe"
IF NOT EXIST "%NODE_EXE%" (
SET "NODE_EXE=node"
)
//'CALL "%NODE_EXE%" "%NPM_CLI_JS%" prefix -g'这一行在npm.cmd起的作用是
//如果能运行这两个命令并且得到结果的话将NPM_PREFIX_NPM_CLI_JS的值设置
//为"\node_modules\npm\bin\npm-cli.js"
SET "NPM_CLI_JS=%~dp0\node_modules\npm\bin\npm-cli.js"
FOR /F "delims=" %%F IN ('CALL "%NODE_EXE%" "%NPM_CLI_JS%" prefix -g') DO (
SET "NPM_PREFIX_NPM_CLI_JS=%%F\node_modules\npm\bin\npm-cli.js"
)
IF EXIST "%NPM_PREFIX_NPM_CLI_JS%" (
SET "NPM_CLI_JS=%NPM_PREFIX_NPM_CLI_JS%"
)
"%NODE_EXE%" "%NPM_CLI_JS%" %*
//现在实际启动npm并运行命令
//这是如何以编程方式使用npm：
conf._exit = true
npm.load(conf, function (er) {
if (er) return errorHandler(er)
npm.commands[npm.command](npm.argv, function (err) {
// https://www.youtube.com/watch?v=7nfPu8qTiQU
if (!err && npm.config.get('ham-it-up') && !npm.config.get('json') && !npm.config.get('parseable') && npm.command !== 'completion') {
output('\n ? I Have the Honour to Be Your Obedient Servant,? ~ npm ??\n')
}
errorHandler.apply(this, arguments)
})
})
'use strict'
// npm install
//
// See doc/cli/npm-install.md for more description
//
// Managing contexts...
// there's a lot of state associated with an "install" operation, including
// packages that are already installed, parent packages, current shrinkwrap, and
// so on. We maintain this state in a "context" object that gets passed around.
// every time we dive into a deeper node_modules folder, the "family" list that
// gets passed along uses the previous "family" list as its __proto__. Any
// "resolved precise dependency" things that aren't already on this object get
// added, and then that's passed to the next generation of installation.
module.exports = install
module.exports.Installer = Installer
var usage = require('./utils/usage')
install.usage = usage(
'install',
'\nnpm install (with no args, in package dir)' +
'\nnpm install [<@scope>/]' +
'\nnpm install [<@scope>/]@' +
'\nnpm install [<@scope>/]@' +
'\nnpm install [<@scope>/]@' +
'\nnpm install ' +
'\nnpm install ' +
'\nnpm install ' +
'\nnpm install ' +
'\nnpm install /',
'[--save-prod|--save-dev|--save-optional] [--save-exact] [--no-save]'
)
//175行定义install方法，这个方法进入核心的install逻辑
function install (where, args, cb) {
if (!cb) {
cb = args
args = where
where = null
}
var globalTop = path.resolve(npm.globalDir, '..')
if (!where) {
where = npm.config.get('global')
? globalTop
: npm.prefix
}
validate('SAF', [where, args, cb])
// the /path/to/node_modules/..
var dryrun = !!npm.config.get('dry-run')
if (npm.config.get('dev')) {
log.warn('install', 'Usage of the `--dev` option is deprecated. Use `--only=dev` instead.')
}
if (where === globalTop && !args.length) {
args = ['.']
}
args = args.filter(function (a) {
return path.resolve(a) !== npm.prefix
})
new Installer(where, dryrun, args).run(cb)
}
//205行定义了Installer类
function Installer (where, dryrun, args, opts) {}
//358行 跟踪器创建
Installer.prototype.newTracker = function (tracker, name, size) {
validate('OS', [tracker, name])
if (size) validate('N', [size])
this.progress[name] = tracker.newGroup(name, size)
return function (next) {
process.emit('time', 'stage:' + name)
next()
}
}
Installer.prototype.finishTracker = function (name, cb) {
validate('SF', arguments)
process.emit('timeEnd', 'stage:' + name)
cb()
}
Installer.prototype.loadCurrentTree = function (cb) {
validate('F', arguments)
log.silly('install', 'loadCurrentTree')
var todo = []
if (this.global) {
todo.push([this, this.readGlobalPackageData])
} else {
todo.push([this, this.readLocalPackageData])
}
todo.push([this, this.normalizeCurrentTree])
chain(todo, cb)
}
//387行 创建node
var createNode = require('./install/node.js').create
下面是官方介绍
This command installs a package, and any packages that it depends on. If the package has a package-lock or shrinkwrap file, the installation of dependencies will be driven by that, with an npm-shrinkwrap.json taking precedence if both files exist. See package-lock.json(5) and npm-shrinkwrap(1).
A package is:
a) a folder containing a program described by a package.json(5) file
b) a gzipped tarball containing (a)
c) a url that resolves to (b)
d) a @ that is published on the registry (see npm-registry(7)) with (c)
Edo Interactive在几年前遇到一个大问题：公司使用交易数据来帮助零售商和餐馆进行个性化促销，但其数据仓库没有足够时间去处理所有的信用卡和借记卡交易数据
“我们要花费27小时来处理每日的数据量，”Edo主管基础设施和信息系统的高级副总裁Tim Garnto说道：“所以在2013年，我们放弃了现有的基于PostgreSQL的关系型数据库系统，使用了Hadoop集群作为公司的数
例如我们把scott.dept表生成文本文件的语句写成dept.sql,内容如下:
set pages 50000;
set lines 200;
set trims on;
set heading off;
spool /oracle_backup/log/test/dept.lst;
select deptno||','||dname||','||loc
1. Download and unzip the SonarQube distribution
2. Starting the Web Server
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昨天在为了把laravel升级到最新的版本，突然之间就出现了如下错误：
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import java.util.Arrays;
import java.util.Random;
public class Nim {
/**编程之美 NIM游戏分析
问题：
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能将剩下的石头一次取光的玩家获胜，每次取石头时，每个玩家只能从若干堆石头中任选一堆，
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处理很简单，修改文件“/etc/yum.repos.d/epel.repo”， 将baseurl的注释取消， mirrorlist注释掉。即可。
&n
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