catch.html

<script>
    (function(){
        let day = 32
        try
        {
            if( day > 31 )
            {
                throw new RangeError( 'Day Cannot Exceed 31' )
            }

            if( day < 1 )
            {
                throw 'invalid'
            }
        }
        catch( err 
        {
            if( err === 'invalid' )
            {
                console.log( 'Variable has invalid value of' + day )
            }
            else
            {
                console.log( err.name + 'Exception: ' + err.message )
            }
        }
        finally
        {
            console.log('The script has ignored the error...')
        }
        )
    })()
</script>