fish-uniapp/pages/user/promotion/Poster/index.vue

<template>
  <div class="distribution-posters">
    <div class="slider-banner banner">
      <swiper indicatorDots="true">
        <block v-for="(item, infoIndex) in info" :key="infoIndex">
          <swiper-item>
            <img class="slide-image" :src="item.wap_poster" mode="widthFix" show-menu-by-longpress />
          </swiper-item>
        </block>
      </swiper>
    </div>
    <div class="keep bg-color-red" @click="saveImg">保存海报</div>
  </div>
</template>
<script>
// import { swiper, swiperSlide } from "vue-awesome-swiper";
import { getSpreadImg } from "@/api/user";

export default {
  name: "Poster",
  components: {
    // swiper,
    // swiperSlide
  },
  props: {},
  data: function() {
    return {
      swiperPosters: {
        speed: 1000,
        effect: "coverflow",
        slidesPerView: "auto",
        centeredSlides: true,
        coverflowEffect: {
          rotate: 0, // 旋转的角度
          stretch: -20, // 拉伸   图片间左右的间距和密集度
          depth: 100, // 深度   切换图片间上下的间距和密集度
          modifier: 3, // 修正值 该值越大前面的效果越明显
          slideShadows: false // 页面阴影效果
        },
        observer: true,
        observeParents: true
      },
      info: [],
      activeIndex: 0
    };
  },
  mounted: function() {
    this.getIndex();
    let that = this;
    // this.swiper.on("slideChange", function() {
    //   that.activeIndex = that.swiper.activeIndex;
    // });
  },
  computed: {
    swiper() {
      // return this.$refs.mySwiper.swiper;
    }
  },
  methods: {
    getIndex: function() {
      let that = this;
      getSpreadImg().then(
        res => {
          that.info = res.data;
        },
        err => {
          that.$dialog.message(err.msg);
        }
      );
    },
    downloadIamge: function(imgsrc, name) {
      // let image = new Image();
      // image.setAttribute("crossOrigin", "anonymous");
      // image.onload = function() {
      //   // let canvas = document.createElement("canvas");
      //   // canvas.width = image.width;
      //   // canvas.height = image.height;
      //   // let context = canvas.getContext("2d");
      //   // context.drawImage(image, 0, 0, image.width, image.height);
      //   // let url = canvas.toDataURL("image/png"); //得到图片的base64编码数据
      //   // let a = document.createElement("a"); // 生成一个a元素
      //   // let event = new MouseEvent("click"); // 创建一个单击事件
      //   // a.download = name || "photo"; // 设置图片名称
      //   // a.href = url; // 将生成的URL设置为a.href属性
      //   // a.dispatchEvent(event); // 触发a的单击事件
      // };
      // image.src = imgsrc;

      var that = this;
      this.isDown = true;
      var downloadUrl = imgsrc;

      if (!wx.saveImageToPhotosAlbum) {
        wx.showModal({
          title: "提示",
          content:
            "当前微信版本过低，无法使用该功能，请升级到最新微信版本后重试。"
        });
        that.openDialogVisible = true;

        return;
      }

      // 可以通过 wx.getSetting 先查询一下用户是否授权了 "scope.writePhotosAlbum" 这个 scope
      wx.getSetting({
        success(res) {
          if (!res.authSetting["scope.writePhotosAlbum"]) {
            that.openDialogVisible = true;

            // 接口调用询问
            wx.authorize({
              scope: "scope.writePhotosAlbum",
              success() {
                that.downloadImage(downloadUrl);
              },
              fail() {
                // 用户拒绝了授权
                // 打开设置页面
                wx.openSetting({
                  success: function(data) {},
                  fail: function(data) {}
                });
              }
            });
          } else {
            that.downloadImage(downloadUrl);
          }
        },
        fail(res) {
          that.openDialogVisible = true;
        }
      });
    },
    saveImg: function() {
      this.downloadIamge(
        this.info[this.activeIndex].wap_poster,
        "poster" + this.activeIndex
      );
    }
  }
};
</script>

<style scoped>
.distribution-posters {
  height: 100%;
}
.banenr {
  height: 100%;
}
.banner swiper {
  height: 100%;
}
.banner .slide-image {
  width: 100%;
  height: auto;
}
</style>