<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<title>Title</title>
<script src="jquery-3.4.1.js"></script>
<script>
//1.页面载入
// $(document).ready(function(){
// $('div').css('color','red');
// })
//页面载入简写方式
$(function () {
$('div').css('color','yellow');
})
</script>
</head>
<body>
<div>hello div</div>
</body>
</html>