下拉菜单

<div class="form-group">            <label for="address" class="col-sm-2 control-label">地&nbsp;&nbsp;&nbsp;&nbsp;址</label>            <div class="col-sm-10">                <input type="text" class="form-control" name="usert.email" id="address"                       placeholder="请选择" list="listaddress">            </div>        </div>

<datalist id="listaddress">    <option>黑龙江省</option>    <option>吉林省</option>    <option>辽宁省</option>    <option>河北省</option></datalist>