For versions of jQuery equal or above (>=) 1.6, use: $("#radio_1").prop("checked", true);. For versions prior to (<) 1.6, use: ... <看更多>

I'm pretty sure the vast majority of Stack Overflow and jQuery FAQ are wrong! jQuery FAQ suggests doing the following found here: https://learn. ... <看更多>

using jquery script getting the selected value of a radiobutton control into a input textbox html element. ... <看更多>

With checked[0] you are getting a reference to the actual DOM element (instead of the jQuery object) but that is unnecessary in your case since jQuery ... ... <看更多>