注意jQuery在获取无线电输入值时的行为:

$('input[name="myRadio"]').change(function(e) { // Select the radio input group

    // This returns the value of the checked radio button
    // which triggered the event.
    console.log( $(this).val() ); 

    // but this will return the first radio button's value,
    // regardless of checked state of the radio group.
    console.log( $('input[name="myRadio"]').val() ); 

});

因此$('input[name="myRadio"]').val()不返回单选输入的检查值，正如您所期望的那样——它返回第一个单选按钮的值。

我只是想确保一些东西被选中(使用jQuery):

// html
<input name="gender" type="radio" value="M" /> Male <input name="gender" type="radio" value="F" /> Female

// gender (required)
var gender_check = $('input:radio[name=gender]:checked').val();
if ( !gender_check ) {
    alert("Please select your gender.");
    return false;
}

这是我为了解决这个问题而创建的效用函数

    //define radio buttons, each with a common 'name' and distinct 'id'. 
    //       eg- <input type="radio" name="storageGroup" id="localStorage">
    //           <input type="radio" name="storageGroup" id="sessionStorage">
    //param-sGroupName: 'name' of the group. eg- "storageGroup"
    //return: 'id' of the checked radioButton. eg- "localStorage"
    //return: can be 'undefined'- be sure to check for that
    function checkedRadioBtn(sGroupName)
    {   
        var group = document.getElementsByName(sGroupName);

        for ( var i = 0; i < group.length; i++) {
            if (group.item(i).checked) {
                return group.item(i).id;
            } else if (group[0].type !== 'radio') {
                //if you find any in the group not a radio button return null
                return null;
            }
        }
    }

HTML:

<label class="block"><input type="radio" name="calculation" value="add">+</label>
<label class="block"><input type="radio" name="calculation" value="sub">-</label>
<label class="block"><input type="radio" name="calculation" value="mul">*</label>
<label class="block"><input type="radio" name="calculation" value="div">/</label>

<p id="result"></p>

JAVAScript:

var options = document.getElementsByName("calculation");

for (var i = 0; i < options.length; i++) {
    if (options[i].checked) {
        // do whatever you want with the checked radio
        var calc = options[i].value;
        }
    }
    if(typeof calc == "undefined"){
        document.getElementById("result").innerHTML = " select the operation you want to perform";
        return false;
}

只是对马克·比克做了一点点修改;

HTML代码

<form name="frm1" action="" method="post">
  <input type="radio" name="gender" id="gender_Male" value="Male" />
  <input type="radio" name="gender" id="gender_Female" value="Female" / >
  <input type="button" value="test"  onclick="check1();"/>
</form>

和Javascript代码来检查单选按钮是否被选中

<script type="text/javascript">
    function check1() {            
        var radio_check_val = "";
        for (i = 0; i < document.getElementsByName('gender').length; i++) {
            if (document.getElementsByName('gender')[i].checked) {
                alert("this radio button was clicked: " + document.getElementsByName('gender')[i].value);
                radio_check_val = document.getElementsByName('gender')[i].value;        
            }        
        }
        if (radio_check_val === "")
        {
            alert("please select radio button");
        }        
    }
</script>

这对于具有相同名称的单选按钮是有效的，不需要JQuery。

var x = Array.prototype.filter.call(document.getElementsByName('checkThing'), function(x) { return x.checked })[0];

如果我们正在讨论复选框，并且我们想要一个列表，其中选中的复选框共享一个名称:

var x = Array.prototype.filter.call(document.getElementsByName('checkThing'), function(x) { return x.checked });