How do I use Google Script If Statements?

I am familiar with Excel VBA but am new to Google Script Editing

I am trying to use a simple IF statement to insert a new line above line 2 if cells A2 & B2 are NOT Blank.

  function AddaLine() {
if (B1 == false)
  var spreadsheet = SpreadsheetApp.getActive();
  spreadsheet.getRange('2:2').activate();
  spreadsheet.getActiveSheet().insertRowsBefore(spreadsheet.getActiveRange().getRow(), 1);
  spreadsheet.getActiveRange().offset(0, 0, 1, spreadsheet.getActiveRange().getNumColumns()).activate();
  spreadsheet.getRange('A2').activate();
};

where cell B1 contains

=isblank(A2:B2)

or

function AddaLine() {
  if (A2, B2 != null)
  var spreadsheet = SpreadsheetApp.getActive();
  spreadsheet.getRange('2:2').activate();
  spreadsheet.getActiveSheet().insertRowsBefore(spreadsheet.getActiveRange().getRow(), 1);
  spreadsheet.getActiveRange().offset(0, 0, 1, spreadsheet.getActiveRange().getNumColumns()).activate();
  spreadsheet.getRange('A2').activate();
};

Every combination I can think of returns errors. Any help would be appreciated.