jQuery 是一个JavaScript框架.它兼容CSS3,还兼容各种浏览器.
简单的入门程序:必须导入jQuery包
<script type="text/javascript" src="../../js/jquery-3.2.1.js"></script>
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>jquety入门</title>
<script type="text/javascript" src="../../js/jquery-3.2.1.js"></script>
<script>
$(function () {
alert("hello jquery");
});
</script>
</head>
<body>
</body>
</html>