What is the js code to check mine exists ?

[hoanhtuan-hat]

I have some question:

• What is the js code to check if the iron mine exists or not ? The item.GetBuildingName_string() return depleted_ironMine , not know if the iron mine has already built or not
• What is the code to place the building on ironMine ?
• Where to know to class functionality (obj and function, i.e item.GetBuildingName_string() )?
  Many thanks