JavaScript 中的事件冒泡与事件捕获?

javascriptweb developmentobject oriented programming

事件冒泡 − 每当元素上发生事件时，事件处理程序将首先在该元素上运行，然后在其父元素上运行，最后一直到其其他祖先。

事件捕获 − 它是事件冒泡的逆过程，在这里事件从父元素开始，然后到其子元素。

以下是 JavaScript 中事件冒泡与事件捕获的代码 −

示例

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>Document</title>
<style>
   body {
      font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
   }
   .result {
      font-size: 18px;
      font-weight: 500;
      color: blueviolet;
   }
   .outer {
      display: inline-block;
      width: 400px;
      height: 200px;
      font-size: 20px;
      background-color: chartreuse;
   }
   .inner {
      width: 200px;
      height: 100px;
      font-size: 20px;
      background-color: blueviolet;
      text-align: center;
      margin: 20px;
   }
   .tags {
      display: inline-block;
      width: 400px;
      font-weight: bold;
      font-size: 18px;
   }
</style>
</head>
<body>
<h1>Event bubbling vs event capturing</h1>
<div class="outer">
OUTER
<div class="inner">INNER</div>
</div>
<div class="outer">
OUTER
<div class="inner">INNER</div>
</div>
<br />
<div class="tags">Bubbling</div>
<div class="tags">Capturing</div>
<div class="result"></div>
<script>
   let outerDiv = document.querySelectorAll(".outer");
   let innerDiv = document.querySelectorAll(".inner");
   let resEle = document.querySelector(".result");
   outerDiv[0].addEventListener("click", () => {
      resEle.innerHTML += "Outer div has been clicked" + "<br>";
   });
   innerDiv[0].addEventListener("click", () => {
      resEle.innerHTML = "";
      resEle.innerHTML += "Inner div has been clicked" + "<br>";
   });
   outerDiv[1].addEventListener("click",() => {
      resEle.innerHTML = "";
      resEle.innerHTML += "Outer div has been clicked" + "<br>";
   },true);
   innerDiv[1].addEventListener("click",() => {
      resEle.innerHTML += "Inner div has been clicked" + "<br>";
   }, true);
</script>
</body>
</html>