data: {
    host: getApp().globalData.baseUrl,
    carouselList:[],
  },
 onLoad: function (options) {
    this.requestCarouselListData();//請求輪播圖
  },
  //請求輪播圖
  requestCarouselListData(){
    var that = this;//注意this指向性問題
    var urlStr = that.data.host + "/xjj/chome_carousel_list.json"; //請求連接注意替換（我用本地服務器模擬）
    console.log("請求輪播圖：" + urlStr);
    wx.request({
      url: urlStr,
      data: {//這里放請求參數，如果傳入參數值不是String，會被轉換成String 
        // x: '',
        // y: ''
      },
      header: {
        'content-type': 'application/json' // 默認值
      },
      success(res) {
        console.log("輪播圖返回值：");
        console.log(res.data.result);
        var resultArr = res.data.result;
        that.setData({
          carouselList: resultArr
        })
      }
    })
  },

//點擊了輪播圖
chomeCarouselClick: function (event) {
    var urlStr = event.currentTarget.dataset.url;
    console.log("點擊了輪播圖：" + urlStr);
    // wx.navigateTo({
    //   url: 'test?id=1'
    // })
  },

<!-- 輪播圖 -->
<view class='carousel'> 
  <swiper class='carousel_swiper' indicator-dots="true" indicator-color="#f4f4f4" indicator-active-color="#4eb8b8" autoplay="true" interval='2000' circular='true'>
    <block wx:for="{{carouselList}}" wx:key="key">
      <swiper-item bindtap='chomeCarouselClick' data-url='{{item.url}}'>
        <image class="carouselImg" src='{{host}}{{item.img}}' mode='aspectFill' ></image>
      </swiper-item>
    </block>
  </swiper>
 </view>
/*幾個有用的說明：
  indicator-dots 是否顯示指示器
  indicator-color 指示器默認顏色
  indicator-active-color   指示器選中顏色
  autoplay 是否自動播放
  interval 每一頁停留的時長
  circular 播放到最后一頁后是否再銜接第一頁循環播放
*/

page { //這個是當前頁整體的背景色
  background-color: #f4f4f4;
}
.carousel{
  width: 100%;
  background-color: rebeccapurple;
}
.carousel_swiper{
  width: 100%;
  height: 400rpx;
  display: block;
  position: relative;
  background: #f4f4f4;
}
.carouselImg{
  width: 100%;
  height: inherit;
}

本地服務器 輪播圖的數據 chome_carousel_list.json
{
    "result": [{
            "id": "101",
            "img": "/xjj/img/carousel_1.png",
            "title": "",
            "url": "https://www.baidu.com/"
        },
        {
            "id": "102",
            "img": "/xjj/img/carousel_2.png",
            "title": "百度翻譯",
            "url": "https://fanyi.baidu.com/"
        },
        {
            "id": "103",
            "img": "/xjj/img/carousel_3.png",
            "title": "百度地圖",
            "url": "https://map.baidu.com/"
        },
        {
            "id": "104",
            "img": "/xjj/img/carousel_4.png",
            "title": "簡書是一個寫博客的網站，挺好用的，可以試試看",
            "url": "https://www.jianshu.com/"
        }
    ]
}