摘要：<!DOCTYPE html><html><head> <meta charset="utf-8"> <title>选择器练习</title> <script type="text/javascript" src="jquery-3.3.1.min.js">
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>选择器练习</title>
<script type="text/javascript" src="jquery-3.3.1.min.js"></script>
</head>
<body>
<script type="text/javascript">
$(document).ready(function(){
$(":text").css("background-color","red");
})
</script>
<form >
用户名: <input type="text" name="user"><br>
密码: <input type="password" name="password"><br>
<button type="button">按钮</button>
</body>
</html>
批改老师：天蓬老师批改时间：2018-12-25 13:06:11
老师总结：在这个案例中, 推荐在伪类前加上其它标识符,例如id
