给单选按钮选择默认值以及获取单选按钮选择值

var a = '${Book_mettingRooms}';
var Book_mettingRooms = document.getElementsByName("Book_mettingRoomsStep");、

for ( var i = 0; i < Book_mettingRooms.length; i++) {
if (a == Book_mettingRooms[i].value) {
Book_mettingRooms[i].checked = true;

}
}

var Book_mettingRooms = $("input[name='Book_mettingRoomsStep']:checked") .val();

<span class="form_td form_td_center">
<label><input type="radio" name="Book_mettingRoomsStep" value="1"/> 是</label>
  
<label><input type="radio" name="Book_mettingRoomsStep" value="0" checked="checked"/> 否</label>
</span>
<span class="form_td"></span>