Detailed explanation of obtaining, assigning, and registering radio values ​​in HTML

<span>group1:</span>
<input type="radio" id="radio1" checked="checked" name="group1" />radio1
<input type="radio" id="radio2" name="group1" />radio2
<input type="radio" id="radio3" name="group1" />radio3

<span>group2:</span>
<input type="radio" id="radio4" checked="checked" name="group2" />radio4
<input type="radio" id="radio5" name="group2" />radio5
<input type="radio" id="radio6" name="group2" />radio6

var group1 = $("[name='group1']").filter(":checked");
console.log(group1.attr("id"));

$("#radio2").attr("checked", "checked");

$("#radio1").removeAttr("checked");

$("[name='group1']").on("change",
function (e) {
console.log($(e.target).val());
}
);