Radio checked problem in jquery_jquery

Today was so crazy that I searched for this difficult question all afternoon. In the end, a friend from csdn gave me the correct answer. Thank you to this friend

// $("#ISOK1").checked = "checked";
// $("#ISOK1").attr("checked", true);
//$("#Radio1").attr("checked", true);
// $("#Radio1").checked = "checked";
$("#ISOK1")[0].checked = true;

Thanks also to another netizen for telling me

If you are using jquery1.9 or later, attr should not work. You need to use $(this).prop("checked", true);$(this).removeAttr("checked"); to select and remove the selection.

Thank you also to him