微信小程序轮播图
Vue酱 人气:01、wxss样式:
/* 页面显示图片的框 */ .showTableBox { position: relative; width: 100%; height: 180px; overflow: hidden; } /* img图片所在的父元素盒子,有几张img,width就设置百分之几百 */ .slideshowImgBox { position: absolute; z-index: 1; width: 500%; height: 100%; } /* img width设置为: 100% / 图片总数 的百分比 */ .slideshowImgBox image { width: 20%; height: 100%; float: left; } /* 下方小圆点样式*/ .circleBox { width: 100%; position: absolute; bottom: 10px; justify-content: center; } .circle { width: 5px; height: 5px; border-radius: 50%; background-color: #F5F5F5; margin: 0 5px; z-index: 999; } .circleActive { background-color: #BF360C; }
其实到这里适配就完成啦,下面是怎么手写一个轮播图哈哈
2、js代码:
page({ data: { leftNum: 0,//type为number的偏移量,方便计算 imgLeft: "0", //偏移量, screenWidth: 0, //屏幕width changCircleIndex: 0, //对应圆球的下标,css根据页面下标显示对应class slideshowImgs: ["../images/beiJing.jpg", "../images/chengDu.jpg", "../images/shangHai.jpg", "../images/chongQing.jpg", "../images/beiJing.jpg" ], }, onLoad: function (options) { this.setData({ screenWidth: wx.getSystemInfoSync().windowWidth //获取屏幕宽度 }) this.imageCarousel() }, imageCarousel: function () { let imgOverallWidth = this.data.screenWidth * (this.data.slideshowImgs.length - 1) let timer = setInterval(() => { this.data.imgLeft = `${this.data.leftNum -= this.data.screenWidth}px` this.setData({ imgLeft: this.data.imgLeft, changCircleIndex: -(this.data.leftNum / this.data.screenWidth) }) if (this.data.leftNum === -imgOverallWidth) { this.setData({ changCircleIndex: 0, leftNum: 0, imgLeft: `${this.data.leftNum}px` }) } }, 3000) }, })
3、wxml代码:
<view class="photo"> <view class="photoFixedBox"> <view class="showTableBox"> <view class="slideshowImgBox" style="left:{{imgLeft}};"> <!--这里列表渲染的图片一共五张,第一张和最后一张是同一张图,防止轮播时出现白屏 --> <image wx:for="{{slideshowImgs}}" src="{{item}}"></image> </view> <view class="circleBox flex"> <!-- {{changCircleIndex === index ? 'circleActive' : ''}}"是动态class,根据index来改变圆点颜色 --> <view wx:for="{{slideshowImgs.length-1}}" class="circle {{changCircleIndex === index ? 'circleActive' : ''}}"></view> </view> </view> <view class="photoClassifyBigBOx"> <view class="imgClassifyBox flex" wx:for="{{imgClassify}}"><text>{{item}}</text></view> </view> </view> </view>
以上就是整个轮播图的实现啦,圆点的变色显示index根据图片left的偏移量距离来计算:偏移量 / 显示框的宽度,
其实微信小程序有swiper组件,使用也是很方便的。
加载全部内容