如何使用jQuery通过其ID属性选择元素？
元素ID选择器选择具有给定id属性的单个元素。选择方法如下：
$('#elementid')您可以尝试运行以下代码，以学习如何使用jQuery通过其ID属性选择元素：
<html>
<head>
<title>jQuery Selector</title>
<script src = "https://cdn.staticfile.org/jquery/3.2.1/jquery.min.js"></script>
<script>
$(document).ready(function() {
$("#div2").css("background-color", "yellow");
});
</script>
</head>
<body>
<div class = "big" id = "div1">
<p>This is first division of the DOM.</p>
</div>
<div class = "medium" id = "div2">
<p>This is second division of the DOM.</p>
</div>
<div class = "small" id = "div3">
<p>This is third division of the DOM</p>
</div>
</body>
</html>