This is just off the top of my head, but you could do an onClick event for each radio button, give them all different IDs, and then make a for loop in the event to go through each radio button in the group and find which is was checked by looking at the 'checked' attribute. The id of the checked one would be stored as a variable, but you might want to use a temp variable first to make sure that the value of that variable changed, since the click event would fire whether or not a new radio button was checked.

这对我很有用

<input ID="TIPO_INST-0" Name="TIPO_INST" Type="Radio" value="UNAM" onchange="convenio_unam();">UNAM

<script type="text/javascript">
            function convenio_unam(){
                if(this.document.getElementById('TIPO_INST-0').checked){
                    $("#convenio_unam").hide();
                }else{
                    $("#convenio_unam").show(); 
                }                               
            }
</script>

<input type="radio" name="brd" onclick="javascript:brd();" value="IN">   
<input type="radio" name="brd" onclick="javascript:brd();" value="EX">` 
<script type="text/javascript">
  function brd() {alert($('[name="brd"]:checked').val());}
</script>

如图所示: http://www.w3schools.com/jsref/event_onchange.asp 单选按钮不支持onchange属性。

您链接的第一个SO问题给出了答案:使用onclick事件，并检查它触发的函数内部的单选按钮状态。

博士Tl;

'focusout'在'change'事件之前被分派-示例:

const radioName = 'radio';

// Add radios
document.body.innerHTML = `
<style>
input + label {
  margin-left: 1rem;
}
</style>
<form action="#" name="example-form">
  <fieldset>
    ${Array(5).fill(null, 0, 5).map((_, i) => {
        const offsetId = i + 1;
        const id = `radio-${offsetId}`;
        return `<label for="${id}">Radio ${offsetId}</label>
        <input type="radio" name="${radioName}" id="${id}" value="${offsetId}" />`;
      }).join('\n')}
  </fieldset>
</form>
`;

const {log} = console,

    form = document.forms['example-form']; 

form.addEventListener('submit', e => e.preventDefault());

form.addEventListener('change', e => {
    const {target} = e;
    if (target.matches(`[type="radio"][name="${radioName}"]`)) {
        log(`[${e.type}]: "${target.id}" selected;  Value: ${target.value}`);
    }
});

form.addEventListener('focusout', e => {
    const {target} = e,

        soonToBePrevValue = target && target.form ? 
            target.form.elements[radioName].value : null;
    
    if (!target.matches(`[type="radio"][name="${radioName}"]`) || !soonToBePrevValue) {
        return;
    }

    // value, for '[name="radio"]', contained in form, will change after 'focusout' event
    // has completed it's bubbling stage.
    log(`[${e.type}]: previously selected radio value: ` + 
        `${soonToBePrevValue}`);
        
    // log("Soon to be \"previous\" radio: ", target);
});

斯菲德尔

This is just off the top of my head, but you could do an onClick event for each radio button, give them all different IDs, and then make a for loop in the event to go through each radio button in the group and find which is was checked by looking at the 'checked' attribute. The id of the checked one would be stored as a variable, but you might want to use a temp variable first to make sure that the value of that variable changed, since the click event would fire whether or not a new radio button was checked.