<div class="form-group" id='rule4' style='display:none;'> <div class="col-sm-12"> <div class="input-group"> <span class="input-group-addon">請設置正確答案:</span> <input name='key' type="text" class="form-control" placeholder="默認是a" value='a'> </div> <div class="input-group"> <span class="input-group-addon">a</span> <input name='a' type="text" class="form-control" placeholder="必填,最多10個字"> </div> <div class="input-group"> <span class="input-group-addon">b</span> <input name='b' type="text" class="form-control" placeholder="必填,最多10個字"> </div> </div> </div>