Node.js 除非首先删除节点\模块文件夹，否则NPM安装不工作？

我有一个VisualStudioTeamServices构建定义，第一步是“npm安装”。此定义部署到azure web应用程序

NPM完成时没有错误，但是当访问web应用程序时，会抛出错误“找不到模块‘express’”。从“wwwroot”文件夹（web app文件和package.json所在的文件夹）手动运行“npm install”时，命令再次成功完成，但错误仍然存在

但是，当我从“wwwroot”文件夹中删除“node_modules”并再次运行“npm install”时，错误消失了，web应用程序按预期运行

如何修复生成定义，使这些手动步骤在每次部署中都不需要

my package.json的相关摘录如下：

 "dependencies": {
    "express": "^4.13.4",
    "pug": "^2.0.0-alpha7",
    "bluebird": "^3.4.1",
},

npm日志如下所示：

    2016-08-21T01:19:28.9476070Z ##[debug]check path : C:\LR\MMS\Services\Mms\TaskAgentProvisioner\Tools\agents\1.104.1\tasks\Npm\0.2.15\task.json
2016-08-21T01:19:28.9476070Z ##[debug]set resource file to: C:\LR\MMS\Services\Mms\TaskAgentProvisioner\Tools\agents\1.104.1\tasks\Npm\0.2.15\task.json
2016-08-21T01:19:28.9486073Z ##[debug]system.culture=en-US
2016-08-21T01:19:28.9646119Z ##[debug]check path : C:\Program Files\nodejs\npm.cmd
2016-08-21T01:19:28.9656074Z ##[debug]npm=C:\Program Files\nodejs\npm.cmd
2016-08-21T01:19:28.9666075Z ##[debug]cwd=C:\a\1\s
2016-08-21T01:19:28.9686074Z ##[debug]path exists: C:\a\1\s
2016-08-21T01:19:28.9696068Z ##[debug]command=install
2016-08-21T01:19:28.9696068Z ##[debug]C:\Program Files\nodejs\npm.cmd arg: install
2016-08-21T01:19:28.9706071Z ##[debug]arguments=null
2016-08-21T01:19:28.9706071Z ##[debug]exec tool: C:\Program Files\nodejs\npm.cmd
2016-08-21T01:19:28.9716073Z ##[debug]Arguments:
2016-08-21T01:19:28.9716073Z ##[debug]   install
2016-08-21T01:19:28.9726071Z [command]C:\Program Files\nodejs\npm.cmd install
2016-08-21T01:19:43.5330503Z smart-iot@1.0.0 C:\a\1\s
2016-08-21T01:19:43.5330503Z +-- azure-iot-device-amqp@1.0.10
2016-08-21T01:19:43.5340519Z | +-- azure-iot-amqp-base@1.0.10
2016-08-21T01:19:43.5340519Z | | +-- amqp10@3.2.2
2016-08-21T01:19:43.5340519Z | | | +-- node-amqp-encoder@0.0.2 
2016-08-21T01:19:43.5350499Z | | | +-- node-int64@0.4.0 
2016-08-21T01:19:43.5350499Z | | | `-- stately.js@1.3.0 
2016-08-21T01:19:43.5360508Z | | `-- amqp10-transport-ws@0.0.3
2016-08-21T01:19:43.5360508Z | |   `-- nodejs-websocket@1.6.0 
2016-08-21T01:19:43.5370502Z | `-- azure-iot-device@1.0.10
2016-08-21T01:19:43.5370502Z |   `-- azure-storage@1.1.0
2016-08-21T01:19:43.5370502Z |     `-- readable-stream@2.0.6
2016-08-21T01:19:43.5380497Z |       +-- process-nextick-args@1.0.7 
2016-08-21T01:19:43.5380497Z |       `-- util-deprecate@1.0.2 
2016-08-21T01:19:43.5390498Z +-- express@4.14.0
2016-08-21T01:19:43.5390498Z | +-- accepts@1.3.3
2016-08-21T01:19:43.5390498Z | | `-- mime-types@2.1.11
2016-08-21T01:19:43.5400508Z | |   `-- mime-db@1.23.0 
2016-08-21T01:19:43.5400508Z | +-- array-flatten@1.1.1 
2016-08-21T01:19:43.5420690Z | +-- content-disposition@0.5.1 
2016-08-21T01:19:43.5420690Z | +-- cookie-signature@1.0.6 
2016-08-21T01:19:43.5430497Z | +-- debug@2.2.0 
2016-08-21T01:19:43.5430497Z | | `-- ms@0.7.1 
2016-08-21T01:19:43.5440674Z | +-- depd@1.1.0 
2016-08-21T01:19:43.5440674Z | +-- escape-html@1.0.3 
2016-08-21T01:19:43.5450502Z | +-- etag@1.7.0 
2016-08-21T01:19:43.5450502Z | +-- finalhandler@0.5.0
2016-08-21T01:19:43.5460530Z | | `-- unpipe@1.0.0 
2016-08-21T01:19:43.5460530Z | +-- fresh@0.3.0 
2016-08-21T01:19:43.5470497Z | +-- merge-descriptors@1.0.1 
2016-08-21T01:19:43.5470497Z | +-- methods@1.1.2 
2016-08-21T01:19:43.5480496Z | +-- on-finished@2.3.0 
2016-08-21T01:19:43.5480496Z | | `-- ee-first@1.1.1 
2016-08-21T01:19:43.5490499Z | +-- parseurl@1.3.1 
2016-08-21T01:19:43.5490499Z | +-- path-to-regexp@0.1.7 
2016-08-21T01:19:43.5500513Z | +-- proxy-addr@1.1.2
2016-08-21T01:19:43.5500513Z | | `-- forwarded@0.1.0 
2016-08-21T01:19:43.5500513Z | +-- send@0.14.1
2016-08-21T01:19:43.5510491Z | | +-- destroy@1.0.4 
2016-08-21T01:19:43.5510491Z | | `-- mime@1.3.4 
2016-08-21T01:19:43.5520499Z | +-- type-is@1.6.13
2016-08-21T01:19:43.5520499Z | | `-- media-typer@0.3.0 
2016-08-21T01:19:43.5520499Z | `-- utils-merge@1.0.0 
2016-08-21T01:19:43.5530492Z `-- pug@2.0.0-beta4
2016-08-21T01:19:43.5530492Z   +-- pug-code-gen@0.0.7 
2016-08-21T01:19:43.5540495Z   | +-- doctypes@1.1.0 
2016-08-21T01:19:43.5540495Z   | +-- js-stringify@1.0.2 
2016-08-21T01:19:43.5540495Z   | +-- pug-attrs@2.0.1 
2016-08-21T01:19:43.5550503Z   | `-- void-elements@2.0.1 
2016-08-21T01:19:43.5550503Z   +-- pug-filters@1.2.3
2016-08-21T01:19:43.5550503Z   | +-- clean-css@3.4.19
2016-08-21T01:19:43.5560494Z   | | `-- source-map@0.4.4 
2016-08-21T01:19:43.5560494Z   | |   `-- amdefine@1.0.0 
2016-08-21T01:19:43.5570499Z   | +-- jstransformer@1.0.0
2016-08-21T01:19:43.5570499Z   | | +-- is-promise@2.1.0 
2016-08-21T01:19:43.5570499Z   | | `-- promise@7.1.1 
2016-08-21T01:19:43.5580491Z   | +-- pug-walk@0.0.3 
2016-08-21T01:19:43.5580491Z   | +-- resolve@1.1.7 
2016-08-21T01:19:43.5590498Z   | `-- uglify-js@2.7.0
2016-08-21T01:19:43.5590498Z   |   +-- source-map@0.5.6 
2016-08-21T01:19:43.5590498Z   |   +-- uglify-to-browserify@1.0.2 
2016-08-21T01:19:43.5600495Z   |   `-- yargs@3.10.0 
2016-08-21T01:19:43.5600495Z   |     +-- camelcase@1.2.1 
2016-08-21T01:19:43.5600495Z   |     +-- cliui@2.1.0 
2016-08-21T01:19:43.5610497Z   |     | +-- center-align@0.1.3 
2016-08-21T01:19:43.5610497Z   |     | | +-- align-text@0.1.4 
2016-08-21T01:19:43.5620497Z   |     | | | +-- kind-of@3.0.4 
2016-08-21T01:19:43.5620497Z   |     | | | | `-- is-buffer@1.1.4 
2016-08-21T01:19:43.5620497Z   |     | | | +-- longest@1.0.1 
2016-08-21T01:19:43.5630568Z   |     | | | `-- repeat-string@1.5.4 
2016-08-21T01:19:43.5630568Z   |     | | `-- lazy-cache@1.0.4 
2016-08-21T01:19:43.5640500Z   |     | +-- right-align@0.1.3 
2016-08-21T01:19:43.5640500Z   |     | `-- wordwrap@0.0.2 
2016-08-21T01:19:43.5640500Z   |     +-- decamelize@1.2.0 
2016-08-21T01:19:43.5650495Z   |     `-- window-size@0.1.0 
2016-08-21T01:19:43.5650495Z   +-- pug-lexer@2.0.2
2016-08-21T01:19:43.5660502Z   | +-- character-parser@2.2.0 
2016-08-21T01:19:43.5660502Z   | | `-- is-regex@1.0.3 
2016-08-21T01:19:43.5660502Z   | `-- is-expression@2.1.0
2016-08-21T01:19:43.5670500Z   |   `-- object-assign@4.1.0 
2016-08-21T01:19:43.5670500Z   +-- pug-parser@2.0.1
2016-08-21T01:19:43.5670500Z   | `-- token-stream@0.0.1 
2016-08-21T01:19:43.5680491Z   `-- pug-strip-comments@0.0.1 
2016-08-21T01:19:43.5680491Z     `-- pug-error@0.0.0 
2016-08-21T01:19:43.5820489Z ##[debug]rc:0
2016-08-21T01:19:43.5820489Z ##[debug]success:true
2016-08-21T01:19:43.5830501Z ##[debug]task result: Succeeded
2016-08-21T01:19:43.6100505Z Finishing task: Npm

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例如，“express”模块文件夹由于未知原因缺少其“index.js”、“license”和“package.json”文件。

我试过，利用npm安装存档文件复制和发布构建工件Azure Web App部署工作流程来安装包、打包应用程序并部署到Azure Web App

以下是详细的构建步骤参数：

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有关在类似场景中在VSTS中构建和部署工作流的更多信息，请参阅。

请提供问题正文中任何日志中的相关文本。要求人们从随机URL下载未知文件是不合适的。这要么会引起对问题的负面关注，要么会导致问题被完全忽略。此外，如果这个问题依赖于以后可能不存在的文件，那么它在将来与其他人的关系就不那么密切了。请理解，现在按要求进行修改。感谢您提供了非常详细的答案，其中的一个轻微变体“将根文件夹前缀命名为存档路径”被取消选中，解决了我的问题！