<view style='width:100%;height:11%;text-align:center;' class="picture-2"> <image style='width:100%;' class="infoImage"  src="/images/yh.png" mode='widthFix'> </image></view>     <form bindsubmit="MyfromSubmit" report-submit="true"> <view class="Myfrom clear"> <view class="form-text"> <label>您的姓名：</label> <input type="text" placeholder="仅用于预约使用" name="patients" maxlength="32" placeholder-class="input-placeholder" class="from-input" /> </view> <view class="form-text"> <label>您的电话：</label> <input type="text" placeholder="仅用于预约使用" name="tel" maxlength="32" placeholder-class="input-placeholder" class="from-input" /> </view> <view class="form-text"> <picker mode="date" value="{{dateValue}}" start="1999-01-01" end="2999-12-12" bindchange="datePickerBindchange"> <label>预约日期：</label>{{dateValue}} </picker> </view> <view class="form-text"> <label>预约科室：</label> </view> <view class="form-textarea"> <textarea maxlength="200" name="content" placeholder-class="input-placeholder" placeholder="（非必填）可简单描述您的症状或者病情" /> </view> <view class="form-submit"> <button size="default" loading="{{loading}}" class="online-submit" form-type="submit" bindtap="pay">加密提交</button> </view> </view> </form> JS Page({ data: { // text:"这是一个页面" picker1Value: 0, dateValue: '2016-10-13' }, datePickerBindchange: function (e) { this.setData({ dateValue: e.detail.value }) } }) [图片] [图片] 点击了确定日期显示不上去  ，求大神解答！

需要在用户后退的时候弹出提示  确定就后退。取消就还停留本页。怎么实现啊。 onUnload 没法阻止后退啊。这个方法是后退以后才执行的。