Sharepoint - REST API查询字段的结果未定义

I'm using REST/JS calls to populate certain fields from a certain list item. I'm having troubles grabbing some of the fields as they are showing up as undefined when displaying results. I have noticed though, the fields that are showing up as undefined are type: Lookup, Person or Group, or Choice. Types that are showing up are Single line of text, Date and Time, and Number. I have looked through article after article but have not been able to figure it out. Here is a snip it of some of the code I'm talking about:I'm using REST/JS calls to populate certain fie