webpack安装出错

/Users/bbuser/projects/webpack-demo/node_modules/webpack-cli/bin/cli.js:278
			const statsPresetToOptions = require("webpack").Stats.presetToOptions;
			                                                     ^

TypeError: Cannot read property 'presetToOptions' of undefined

　　

webpack-dev-server --open http://localhost:8080/login.html --config webpack.config.js

internal/modules/cjs/loader.js:584
    throw err;
    ^

Error: Cannot find module 'webpack/bin/config-yargs'

　　webpack学习时，容易直接把代码直接粘过来，但是！！！

及其有可能会发生版本不兼容的问题，所以安装的时候建议命令行安装 npm install XXX