Error: Cannot find module 'webpack' at Function.Module._resolveFilename (module.js:548:15)

全部错误信息如下

Error: Cannot find module 'webpack'
    at Function.Module._resolveFilename (module.js:548:15)
    at Function.Module._load (module.js:475:25)
    at Module.require (module.js:597:17)
    at require (C:\node_modules\v8-compile-cache\v8-compile-cache.js:159:20)
    at Object. (C:\node_modules\webpack-cli\bin\convert-argv.js:7:24)
    at Module._compile (C:\node_modules\v8-compile-cache\v8-compile-cache.js:178:30)
    at Object.Module._extensions..js (module.js:664:10)
    at Module.load (module.js:566:32)
    at tryModuleLoad (module.js:506:12)
    at Function.Module._load (module.js:498:3)
    at Module.require (module.js:597:17)
    at require (internal/module.js:11:18)
    at yargs.parse (C:\node_modules\webpack-cli\bin\cli.js:241:14)
    at Object.parse (C:\node_modules\yargs\yargs.js:563:18)
    at C:\node_modules\webpack-cli\bin\cli.js:219:8
    at Object. (C:\node_modules\webpack-cli\bin\cli.js:538:3)
    at Module._compile (module.js:653:30)
    at Object.Module._extensions..js (module.js:664:10)
    at Module.load (module.js:566:32)
    at tryModuleLoad (module.js:506:12)
    at Function.Module._load (module.js:498:3)
    at Module.require (module.js:597:17)
    at require (internal/module.js:11:18)
    at Object. (C:\Users\Administrator\AppData\Roaming\npm\node_modules\webpack\bin\webpack.js:155:2)
    at Module._compile (module.js:653:30)
    at Object.Module._extensions..js (module.js:664:10)
    at Module.load (module.js:566:32)
    at tryModuleLoad (module.js:506:12)
    at Function.Module._load (module.js:498:3)
    at Function.Module.runMain (module.js:694:10)

在vue安装webpack后执行webpack后出现错误，出现此问题请查看
1.vue的版本，如果是4.x版本，查看官网说明如下

npm install --save-dev webpack-cli
2.查看webpack.config.js文件以及中配置

const path = require('path')

module.exports = {
    entry:path.join(__dirname,'./src/main.js'),
    output:{
        path:path.join(__dirname,'./dist'),
        filename:'bundle.js'
    }
}

多数人应该是1的问题，毕竟4以上的版本和以前有些区别。