H5+ 保存图片到手机相册

box11 为保存内容的id

saveImg() {

      this.$toast.loading({

        message: "保存中...",

        forbidClick: true,

      });

      this.createPoster();

    },

    createPoster() {

      const poster = document.getElementById("box11");

      html2canvas(poster, {

        dpi: window.devicePixelRatio * 2,

        backgroundColor: "#fff",

        useCORS: true,

        scale: 2,

        async: true,

      }).then((canvas) => {

        this.dataImg = canvas.toDataURL("image/png");

        console.log(this.dataImg);

        this.toImage();

      });

    },

    toImage() {

      let filename = "下载二维码" + ".png";

      console.log(window.plus);

      if (!window.plus) {

        this.$toast("请长按图片保存到本地");

        return;

      }

      console.log("保存");

      let bitmap = new plus.nativeObj.Bitmap();

      bitmap.loadBase64Data(this.dataImg);

      bitmap.save(

        "_doc/" + filename,

        {

          check: true, // 设置为检测白屏

          overwrite: true,

          quality: 100,

        },

        function(i) {

          //保存到系统相册

          plus.gallery.save(

            i.target,

            function(d) {

              //销毁Bitmap图片

              bitmap.clear();

              plus.nativeUI.alert("保存图片到相册成功");

            },

            function(e) {

              //销毁Bitmap图片

              bitmap.clear();

              plus.nativeUI.alert("保存到系统相册失败,请尝试重新保存");

            }

          );

        },

        function() {

          plus.nativeUI.alert("保存失败,请尝试重新保存");

        }

      );

    },