完整代码

splash.wxml

<view style="height: 100%;width: 100%;">
  <navigator open-type='switchTab' url='/pages/index/index'>
    <view class='tiaoguo'>跳过
      <text>{{time}}</text>
    </view>
  </navigator>
  <swiper style="height: 100%;width: 100%;" indicator-dots>
    <swiper-item wx:for="{{ subjects }}" wx:key="{{ item.id }}" style="flex: 1;">
      <image src="{{ item.images.large }}" mode="aspectFill" style="position: absolute;height:
      100%;width: 100%;opacity: .8;" />
    </swiper-item>
  </swiper>
</view>

splash.js

Page({
  /**
   * 页面的初始数据
   */
  data: {
    time:5,
    subjects: [],
  },
  /**
   * 生命周期函数--监听页面加载
   */
  onLoad: function (options) {
    var that = this;
    const db = wx.cloud.database();
    db.collection('coming_soon').get({
      success: function (res) {
        that.setData({ subjects: res.data[0].subjects })
        // 5秒钟后自动进入主页
        var timer = setInterval(function(){
          if(that.data.time > 0){
            that.setData({
              time: that.data.time - 1
            })
            if(that.data.time == 0){
              clearInterval(timer);
              wx.switchTab({
                url: '/pages/index/index',
              })
            }
          }
        },1000)
      }
    })
  }
})

splash.wxss

.tiaoguo{
  position: absolute;
  top: 20rpx;
  right: 20rpx;
  color: #fff;
  z-index: 100;
}