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+<!DOCTYPE html>
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+<html lang="en">
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+<head>
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+ <meta charset="UTF-8">
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+ <meta name="viewport" content="width=device-width, initial-scale=1.0">
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+ <title>Document</title>
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+ <style>
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+ #box {
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+ width: 400px;
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+ height: 400px;
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+ background: #00f;
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+ }
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+ #box1 {
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+ width: 200px;
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+ height: 200px;
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+ background: #f00;
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+ }
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+ </style>
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+</head>
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+<body>
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+ <div id="box">
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+ <div id="box1"></div>
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+ </div>
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+ <script>
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+ // 事件冒泡
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+ // 事件：冒泡 目标 捕获
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+ let box = document.getElementById("box");
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+ let box1 = document.getElementById("box1");
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+ // box.onClick
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+ box.addEventListener("click",function() {
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+ console.log("1")
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+ },true)
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+ box1.addEventListener("click",function() {
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+ console.log("2")
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+ },true)
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+ </script>
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+</body>
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+</html>
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zheng