[root@FreeServer ~]# webpack -v
/usr/local/node-v4.4.7-linux-x64/lib/node_modules/webpack/bin/webpack.js:3
let webpackCliInstalled = false;
^^^

SyntaxError: Block-scoped declarations (let, const, function, class) not yet supported outside strict mode
    at exports.runInThisContext (vm.js:53:16)
    at Module._compile (module.js:373:25)
    at Object.Module._extensions..js (module.js:416:10)
    at Module.load (module.js:343:32)
    at Function.Module._load (module.js:300:12)
    at Function.Module.runMain (module.js:441:10)
    at startup (node.js:139:18)
    at node.js:968:3
 

這是因為nodejs版本太低，或者說webpack版本太高，我這裏用的nodejs版本是4.4.7，默認安裝的webpack版本是4.3.0，所以不兼容。然後我把webpack卸載掉，重新安裝了2.6.1版本的webpack，問題解決：

[root@FreeServer ~]# npm uninstall webpack -g
unbuild [email protected]
[root@FreeServer ~]# npm install [email protected] -g --registry=https://registry.npm.taobao.org
[root@FreeServer ~]# webpack -v
2.6.1
[root@FreeServer ~]# 
 

安裝webpack後，執行webpack -v命令時報錯：SyntaxError: Block-sc