<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<script src="jquery-3.3.1.min.js"></script>
</head>
<body>
<ul>
<li>111</li>
<li>222</li>
<li>333</li>
<li>444</li>
</ul>
<input type="button" value="+" onclick="add()">
<script>
$("ul").on("click", "li", function(){
alert(888)
})
function add(){
$("ul").append("<li>555</li>")
}
</script>
</body>
</html>
on方法,传递参数
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<script src="jquery-3.3.1.min.js"></script>
</head>
<body>
<p>hello p</p>
</body>
<script>
function myHandler(e){
alert(e.data.foo)
}
$("p").on("click", {foo: "klvchen"}, myHandler)
</script>
</html>