可以使用javascript GAPI而不在源代码末尾包含'？onload ='？

I'm developing an application in Angular, and the google interactions will be within a service that I can use throughout the app. For this reason, I cannot do the usual method of adding in a function name at the end because I need for the service to be set up for the rest of the application to work correctly. I'm developing an application in Angular, and t