升级nodejs版本到5.12.0

Question

I tried to install node.js by NVM in Ubuntu 16.04 server by following this link . And I got:

root@instance-15s8fbzx:/opt# nodejs --version
v4.2.6
root@instance-15s8fbzx:/opt# npm --version
5.3.0
root@instance-15s8fbzx:/opt# node --version
v8.4.0

Then, we I run a mean-stack project by sudo npm start , I got

class User {
^^^^^

SyntaxError: Block-scoped declarations (let, const, function, class) not yet supported outside strict mode

Then, I saw this link , I think maybe because the nodejs version is not correct. I have another server with v5.12.0 as the version of nodejs , and the project worked well there.

Then, I tried to do

sudo npm install -g npm
sudo npm install -g n
sudo n stable
sudo ln -sf /usr/local/n/versions/node/8.4.0/bin/node /usr/bin/node

But the version of the nodejs is still 4.2.6 . Does anyone know how to upgrade its version to 5.12.0 ?

Answer 1

在安装NVM并安装了必需的节点版本之后，请按如下所示选择节点版本：

> nvm use v5.12.0

Answer 2

After upgrading to the Nodejs version, the following error occurred for the Laravel and VUE js packages I already had: 

PHP Fatal error: During inheritance of IteratorAggregate: Uncaught ErrorException: Return type of Symfony\Component\HttpFoundation\ParameterBag::getIterator() should either be compatible with IteratorAggregate::getIterator(): Traversable, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in C:\xampp\htdocs\clerk\vendor\symfony\http-foundation\ParameterBag.php:210

To solve the issue, I did the following: 

1. composer update
2. npm update
3. npm run dev
4. php artisan serve