exception

1. throw

   1
   throw new Error('<Error message>')

   The program will be terminated

2. try

   1
   try{}
   2
   catch(<error>){
   3
       conlose.log(<error>.massage)
   4
   }//error
   5
   finally{}//always

3. debugger

   1
   debugger

   Similar to a breakpoint, the program will pause here

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