动态渲染style 背景图片

前言

最近小程序项目需要一个 弹框 展示 轮播图 。项目用的 mpvue 框架，使用 colorUi 的轮播图时，

          

          <swiper
            class="card-swiper round-dot"
            indicator-dots="true"
            circular="true"
            autoplay="true"
            interval="5000"
            duration="500"
            bindchange="cardSwiper"
            indicator-color="#8799a3"
            indicator-active-color="#0081ff"
          >
            <swiper-item
              v-for="(i,index) in 3"
              :key="index"
              class="cur"
            >
               <view
                class="bg-img shadow-blur"
                style="background-image:url(https://image.weilanwl.com/img/4x3-{{index+1}}.jpg)"
              ></view> 
            </swiper-item>
          </swiper>

不支持 {{ }} 的语法。报错

  - style="background-image:url(https://image.weilanwl.com/img/4x3-{{index+1}}.jpg)": Interpolation inside attributes has been removed. 
    Use v-bind or the colon shorthand instead. For example, instead of <div style="{{ val }}">, use <div :style="val">.

方案

修改为：

          <swiper
            class="card-swiper round-dot"
            indicator-dots="true"
            circular="true"
            autoplay="true"
            interval="5000"
            duration="500"
            bindchange="cardSwiper"
            indicator-color="#8799a3"
            indicator-active-color="#0081ff"
          >
            <swiper-item
              v-for="(i,index) in bagImg"
              :key="index"
              class="cur"
            >
              
               <view
                class="bg-img shadow-blur"
                :style="{backgroundImage:'url('+i+')'}"
              ></view>
            </swiper-item>
          </swiper>                        

　<script>
    export default{
        data(){
            return{
               bagImg:[
                  "https://image.weilanwl.com/img/4x3-1.jpg",
                  "https://image.weilanwl.com/img/4x3-2.jpg",
                  "https://image.weilanwl.com/img/4x3-3.jpg",
               ]
            }
        }
    }
</script>

效果