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JavaScript-DOM/17.addEventListener.js at master · last-endcode/JavaScript-DOM · GitHub
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// select element
// addEventListener
// what event,
// and what to do (callback function/annonymous funciton/function reference)
const
btn
=
document
.
querySelector
(
'.btn'
)
;
const
h3
=
document
.
querySelector
(
'h3'
)
;
btn
.
addEventListener
(
'click'
,
function
(
)
{
// if click btn h3 will add class blue
h3
.
classList
.
add
(
'blue'
)
;
}
)
;
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