1 setting prop1: 1
   2 prop 1: 1
   3 TypeError
   4 global toString 1
   5 [object Object]
   6 false
   7 true
   8 global toString 2
   9 [object Object]
  10 false
  11 true
  12 global toString 3
  13 [object Object]
  14 false
  15 true