如果选中单选按钮如何读取并使用javascript将其保存为1？

Question

我有3个单选按钮:

<div id="step-1">
    <h2 class="StepTitle">
        <label style="font-weight: bold; color: #662819;" id="frage1"></label>
    </h2>
    <br />

    <input type="radio" name="group1" id="antwort1" value="" onmousedown="this.__chk = this.checked" onclick="if (this.__chk) this.checked = false" />
    <label id="antwort1fuerFrage1"></label>
    <br />
    <br />

    <input type="radio" name="group1" id="antwort2" value="" onmousedown="this.__chk = this.checked" onclick="if (this.__chk) this.checked = false" />
    <label id="antwort2fuerFrage1"></label>
    <br />
    <br />

    <input type="radio" name="group1" id="antwort3" value="" onmousedown="this.__chk = this.checked" onclick="if (this.__chk) this.checked = false" />
    <label id="antwort3fuerFrage1"></label>
</div>

我试图读取单选按钮是否被选中,并保存一个值(需要1或/ 0),如下所示:

var frage1 = document.getElementById("frage1").innerHTML;
var antwort1 = document.getElementById("antwort1");
var antwort2 = document.getElementById("antwort2");
var antwort3 = document.getElementById("antwort3");

antwort1 = $('input[id="antwort1"]:checked').val();
antwort2 = $('input[id="antwort2"]:checked').val();
antwort3 = $('input[id="antwort3"]:checked').val();

antwort 1,2,3未定义.我需要得到0或1.

Answer 1

您可以使用,.length因为您正在查询ID:

antwort1 = $('#antwort1:checked').length;
antwort2 = $('#antwort2:checked').length;
antwort3 = $('#antwort3:checked').length;