微信小程序写一个轮播图

<!-- wxml -->
<swiper class='u-wrp-bnr' indicator-dots='true' autoplay='true' interval='5000' duration='1000' circular='true'>
 <block wx:for="{{bnrUrl}}" wx:for-index="index">
   <swiper-item>
     <image src='{{item.url}}' class='u-img-slide' mode='aspectFill'></image>
   </swiper-item>
 </block>
</swiper>
<!-- wxml -->

//js
Page({
  data: {
    "bnrUrl": [{
      "url": "img/1242x366-1531449084.jpg"
    }, {
      "url": "img/1242x366_djj_0706-1530871651.jpg"
    }, {
      "url": "img/1242x366_lyx_0709-1531122892.jpg"
    }, {
      "url": "img/14540040236323_1_o.jpg"
    }]
  }
});
//js

.u-wrp-bnr {
  width: 100%;
  height: 200rpx;
  display: block;
  position: relative;
  top: 100rpx;
  background: #f0f0f0;
}
.u-img-slide {
  width: 100%;
  height: inherit;
}
//wxss

主要用到了几个属性：

属性 功能
indicator-dots='true' 面板指示圆点
autoplay='true' 自动播放
interval='5000' 每次轮播间隔
duration='1000' 轮播动画时长
circular='true' 无缝衔接