Code example $8-1$

$$("$#faqs h$2").$click$($ evt $=>\{$

const h$2=$ evt.currentTarget;

$$($h$2).$toggleClass$("$minus$")$;

if $($$$($h$2).$attr$("$class$")!==$ "minus"$)\{$

$$($h$2).$next$().$hide$()$;

$\}$

else $\{$

$$($h$2).$next$().$show$()$;

$\}$

evt.preventDefault$()$;

$\})$;

$($Refer to code example $8-1)$ What does the parameter named evt refer to$?$