微信小程序==>定义轮播图swiper dots默认样式

html

<view class="swiper-container">
  <swiper autoplay="auto" interval="5000" duration="500" current="{{swiperCurrent}}" bindchange="swiperChange" class="swiper">
    <block wx:for="{{imgUrl}}" wx:key="unique">
      <swiper-item>
        <image src="{{item}}" class="img"></image>
      </swiper-item>
    </block>
  </swiper>
 
  <view class="dots">
    <block wx:for="{{imgUrl}}" wx:key="unique">
      <view class="dot{{index == swiperCurrent ? ' active' : ''}}"></view>
    </block>
  </view>
</view>

wxss

.swiper-container{
  position: relative;
}
.swiper-container .swiper{
  height: 300rpx;
}
.swiper-container .swiper .img{
  width: 100%;
  height: 100%;
}
.swiper-container .dots{
  position: absolute;
  left: 0;
  right: 0;
  bottom: 20rpx;
  display: flex;
  justify-content: center;
}
.swiper-container .dots .dot{
  margin: 0 8rpx;
  width: 14rpx;
  height: 14rpx;
  background: #fff;
  border-radius: 8rpx;
  transition: all .6s;
}
.swiper-container .dots .dotactive{
  width: 24rpx;
  background: #f80;
}

js

data: {
imgUrl: [
  // 里面写图片地址
 'http://img02.tooopen.com/images/20150928/tooopen_sy_143912755726.jpg',
 'http://img06.tooopen.com/images/20160818/tooopen_sy_175866434296.jpg',
 'http://img06.tooopen.com/images/20160818/tooopen_sy_175833047715.jpg'
],
swiperCurrent: 0,
},

swiperChange:function(e){

this.setData({

swiperCurrent: e.detail.current  // current 改变时会触发 change 事件

    })
}

修改成功.png

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wx:key
如果列表中项目的位置会动态改变或者有新的项目添加到列表中，并且希望列表中的项目保持自己的特征和状态（如 <input/> 中的输入内容，<switch/> 的选中状态），需要使用 wx:key 来指定列表中项目的唯一的标识符。