使用Visual Studio Code进行前端开发并运行前端页面时提示如下错误：

npm WARN Local package.json exists, but node_modules missing, did you mean to install?
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! vuedatabase@1.0.0 dev: `webpack-dev-server --inline --progress --config build/
onf.js`
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the vuedatabase@1.0.0 dev script.
npm ERR! This is probably not a problem with npm. There is likely additional logging ou
npm WARN Local package.json exists, but node_modules missing, did you mean to install?

原因是因为没有npm install 生成node_modules目录

解决办法：执行命令：npm install或npm install --registry=https://registry.npm.taobao.org，再重新执行npm run dev即可运行。

具体步骤如下：
指定到当前目录，安装依赖：

npm install

 runnpm audit fixto fix them, ornpm auditfor details

npm WARN optional SKIPPING OPTIONAL DEPENDENCY: fsevents@1.2.4 (node_modules\fsevents):
npm WARN notsup SKIPPING OPTIONAL DEPENDENCY: Unsupported platform for fsevents@1.2.4: wanted {"os":
"darwin","arch":"any"} (current: {"os":"win32","arch":"x64"})

added 1253 packages from 715 contributors and audited 11236 packages in 50.262s
found 308 vulnerabilities (1 low, 9 moderate, 298 high)
run `npm audit fix` to fix them, or `npm audit` for details
指定到当前目录：

npm audit fix --force

'proxy' config is set properly. See: 'npm help config'

清除npm缓存。

npm cache clean --force

原文链接：

1、npm WARN Local package.json exists, but node_modules missing, did you mean to install?

2、解决【npm ERR! Unexpected end of JSON input while parsing near '...sh_time":141072930277'】方案