AngularJS提交功能不能多次调用服务功能

I am entirely new to AngularJS, and I'm trying to implement an API to get businesses by keyword. I want to be able to type in a keyword, call the API, and get an updated list each time I click the submit button. For some reason I can only get the data the first time I click submit; afterwards it no longer calls the service function:I am entirely new to AngularJS, and I'm trying