JAVASCRIPT TRY / CATCH

    //TRY CATCH
    function greetWorld(){
        try{
            var greeting = "Hello World";
            aler(greeting);
        }catch(err){
            alert(err);
        }
    }

    //THROW
    function checkPass(){
        try{
            var pass = document.getElementById("f1").value;
            if (pass.lenght  <8){
                throw "Please enter 9 characters"
            }
        }catch(err){
            alert(err);
        }
    }