<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<script src="jquery-3.3.1.js"></script>
<script>
$(document).ready(function () {
$("button").click(function () {
alert("hello")
});
$("#show").click(sum);
});
function sum() {
alert(2+3)
}
</script>
</head>
<body>
<button>点击1</button>
<input type="button" value="点击2" id="show"/>
</body>
</html>
结果
点击【点击1】按钮弹出”hello”
点击【点击2】按钮弹出”5”