<img :src="imgUrl" alt @touchstart="start" />
        <vue-canvas-poster
          :widthPixels="300"
          :painting="painting"
          @success="success"
          @fail="fail"
          v-show="!imgUrl"
        ></vue-canvas-poster>
        <div @click="start" class="submit_hb">長按下載海報并分享</div>
        //data
        imgUrl: "",
           views: [
          {
            type: "image",
            url: "", // 背景圖 從後台接口中獲取賦值
            css: {
              width: "750px",
              height: "1334px"
            }
          },
          {
            type: "qrcode",
            content: "", //二維碼 從後台接口獲取賦值
            css: {
              top: "950px",
              left: "260px",
              width: "220px",
              height: "220px"
            }
          }
          ]
   //methods中 長按下載
     success(src) {
      this.imgUrl = src;
    },
    fail(err) {
      console.log("fail53", this.painting);
    },

    start() {
      if (!window.plus) return;
      plus.gallery.save(
        this.imgUrl,
        function() {
          alert("保存成功!");
        },
        function() {
          alert("保存失敗，請重試!");
        }
      );
    },