:text 找所有的type="text"的input标签
:radio type="radio"的单选按钮
:checkbox type="cheakbox"的多选按钮
:checked 被选中的
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>表单选择器</title>
</head>
<body>
<input type="radio" name="sex" value="1" />男
<input type="radio" name="sex" value="2" />女
<button id="btn">提交</button>
</body>
<srcipt src=" https://cdn.bootcss.com/jquery/3.5.0/jquery.min.js"></srcipt>
<script>
$("#btn").click(function() {
console.log($(":radio:checked").val())
})
</script>
</html>原文：https://www.cnblogs.com/dongxuelove/p/12933301.html