微信小程序实现banner图轮播效果

indicator-active-color="#007aff"//修改选中图片圆点的颜色

const app = getApp()
 
Page({
 data: {
 //-----------模拟banner图-----------
 imgUrls: [
 '/image/1545118381903.jpg',
 '/image/1545118566631.jpg'
 ],
 circular: true,
 //是否显示画板指示点 
 indicatorDots: true,
 //选中点的颜色 
 //是否竖直 
 vertical: false,
 //是否自动切换 
 autoplay: true,
 //自动切换的间隔
 interval: 3000,
 //滑动动画时长毫秒 
 duration: 1000,
 //所有图片的高度 
 imgheights: [],
 //图片宽度 
 imgwidth: 750,
 //默认 
 current: 0
 },
 imageLoad: function (e) {//获取图片真实宽度 
 var imgwidth = e.detail.width,
 imgheight = e.detail.height,
 //宽高比 
 ratio = imgwidth / imgheight;
 console.log(imgwidth, imgheight)
 //计算的高度值 
 var viewHeight = 750 / ratio;
 var imgheight = viewHeight;
 var imgheights = this.data.imgheights;
 //把每一张图片的对应的高度记录到数组里 
 imgheights[e.target.dataset.id] = imgheight;
 this.setData({
 imgheights: imgheights
 })
 },
 bindchange: function (e) {
 // console.log(e.detail.current)
 this.setData({ current: e.detail.current })
 },
 }
})

<!-------------首页轮播图----------------- -->
<view class='swiper'>
 <swiper indicator-dots="{{indicatorDots}}" vertical="{{vertical}}" autoplay="{{autoplay}}" duration="{{duration}}" interval='{{interval}}'indicator-active-color="#007aff" bindchange="bindchange" circular="{{circular}}" style="height:{{imgheights[current]}}rpx;">
 <block wx:for='{{imgUrls}}' wx:key="{{index}}">
 <swiper-item>
 <image src="{{item}}" data-id='{{index}}' class="slide-image" mode="widthFix" bindload="imageLoad" />
 </swiper-item>
 </block>
 </swiper>
</view>

.swiper image {
 width: 100%;
 height: auto;
}
 
.swiper-image {
 height: 100%;
 width: 100%;
}
 
.slide-image {
 height: 100%;
 width: 100%;
 display: block;
}