问题
I'm using angular 4.2.4 in my application and I want to upgrade to the latest one (4.3.0)
is there an easy and safe way to do that without breaking my application ?
When searching I found this information from:
http://angularjs.blogspot.de/2017/07/angular-43-now-available.html
that link states that Angular 4.3 contains no breaking changes ?
I want to do that upgrade to use HttpClient
回答1:
I think you should be fine. Once you reference the new packages just make sure that your ng build --prod is not breaking.
If you want to use the new HttpClient you have change all parts of your code that referencing Http from @angular/http and replace that with HttpClient from @angular/common/http according with styleguide.
Also you have to change to all related .spec files that referencing old Http as well, then test with ng t, unless you does not care about tests.
If you are looking how upgrade all angular related packages more efficiently just look here How do I correctly upgrade angular 2 (npm) to the latest version?
回答2:
You can use NPM command to update the installed all dependencies.
To update angular
npm install angular@version (Provide version number)
Example : npm install angular@4.3
To download latest angular you can use npm install angular@latest
The command npm update -D && npm update -S will update all packages inside package.json to their latest version.
You can also apply the same command to update HttpClient as wells as all other dependencies
For my application I have upgraded from 4.2.4 to 4.3. Everything works fine. No more issues
来源：https://stackoverflow.com/questions/45909868/how-to-upgrade-from-angular-4-2-4-to-angular-4-3