Html 控件的隐藏
1 隐藏并且不占据的位置
document.getElementById('myVideo').style.display = "none”;//隐藏
document.getElementById('myVideo').style.display = “block”;//显示
2 隐藏但是仍占据的位置
document.getElementById(Id).style.visibility=‘hidden’//隐藏
document.getElementById(Id).style.visibility=’visible‘;//显示
radio 点击事件,点击一个选项则触发一次
<input type="radio" id="viewer_role" name="userRole" value="viewer" onclick="hidControl('hidden')">
<script>
function hidControl(action){
hid("btn-on-off-camera",action);
</script>
3 radio 变为不可选状态
document.getElementById("teacher_role").disabled = false;//不可选
document.getElementById("teacher_role").disabled = true//可选