예제가 포함된 JavaScript addEventListener()

예제가 포함된 JavaScript addEventListener()

그만큼 addEventListener() 메서드 EventTarget 인터페이스는 지정된 이벤트가 대상에 전달될 때마다 호출되는 함수를 설정합니다. 이 방법을 사용하면 요소에 여러 이벤트 핸들러를 허용하여 웹 애플리케이션 내에서 동적이고 유연한 상호 작용 관리를 가능하게 합니다.

통사론:

element.addEventListener(event, listener, useCapture); 

매개변수:

  • 이벤트: 이벤트는 유효한 JavaScript 이벤트일 수 있습니다. 이벤트는 onclick 대신 click을 사용하거나 onmousedown 대신 mousedown을 사용하는 것과 같이 접두사 없이 사용됩니다.
  • 리스너(핸들러 함수): 발생하는 이벤트에 응답하는 JavaScript 함수일 수 있습니다.
  • 사용캡처: 이벤트 전파를 제어하는 ​​데 사용되는 선택적 매개변수입니다. 부울 값이 전달됩니다. 진실 캡처 단계를 나타냅니다. 거짓 버블링 단계를 나타냅니다.

예시 1: 이 예에서는 버튼을 클릭하면 웹페이지에 텍스트가 표시됩니다.

HTML
          문서제목> 머리> <body>  <button id='try'>여기를 클릭하세요버튼> <h1 id='text'>h1> <script>document.getElementById('try').addEventListener('click', function () { document.getElementById('text').innerText = 'techcodeview.com'; });  스크립트> 본문> html> </pre>  </code>  <p dir='ltr'>  <b>  <strong>산출: </strong>  </b>  <span>  </span> </p>  <img src='//techcodeview.com/img/javascript-methods/82/javascript-addeventlistener-with-examples.webp' alt='예제가 포함된 JavaScript addEventListener()'> <p>예제가 포함된 JavaScript addEventListener() </p>  <p dir='ltr'>  <br>  <b>  <strong>예 2: </strong>  </b>  <span>이 예에서는 mouseover 및 mouseout 두 이벤트가 동일한 요소에 추가됩니다. 텍스트 위에 마우스를 올리면 mouseover 이벤트가 발생하고 RespondMouseOver 함수가 호출됩니다. 마찬가지로 mouseout 이벤트의 경우 RespondMouseOut 함수가 호출됩니다. </span> </p>HTML <code>  <pre>  <html lang='en'>  <head>  <meta charset='UTF-8'>  <meta name='viewport' content='width=device-width,  initial-scale=1.0'>  <title>문서제목> 머리> <body>  <button id='clickIt'>여기를 클릭하세요버튼> <p id='hoverPara'>이 텍스트 위로 마우스를 가져가세요 !p> <b id='effect'>비> <script>const x = document.getElementById('clickIt');  const y = document.getElementById('hoverPara');  x.addEventListener('click', RespondClick);  y.addEventListener('mouseover', RespondMouseOver);  y.addEventListener('mouseout', RespondMouseOut);  function RespondMouseOver() { document.getElementById('효과').innerHTML += 'MouseOver 이벤트' + ' ';  } function RespondMouseOut() { document.getElementById('효과').innerHTML += 'MouseOut 이벤트' + ' ';  } function RespondClick() { document.getElementById('효과').innerHTML += '클릭 이벤트' + ' ';  } 스크립트> 본문> html> </pre>  </code>  <p dir='ltr'>  <b>  <strong>산출: </strong>  </b>  <span>  </span> </p>  <img src='//techcodeview.com/img/javascript-methods/82/javascript-addeventlistener-with-examples-2.webp' alt='예제가 포함된 JavaScript addEventListener()'> <p>예제가 포함된 JavaScript addEventListener() </p>  <br>  <br>
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