How javascript try…catch statement works

Question

I am trying to test in browsermob if certain input field work or not. I am attempting to use a try...catch statement which I have never used before. I know that the form is:

Answer 1

the stuff inside try {...} is what you want to execute. The stuff in catch() { ... } is what you want to execute if you get any javascript errors from anything executed in the try {...}

catch {...} only executes if there is a javascript error in the try {...} block. You can find out what the error is by doing for example this:

try {
 // do something 
} catch (err) {
  alert(err);
}