[游戏开发]用canvas将图片和文字转化成照片，并复制到剪贴版

用canvas将图片和文字转化成照片，并复制到剪贴版

//需引入html2canvas.js
	//被复制的div
	  var delivery = document.getElementsByClassName("delivery");
	  //复制的div
      var seconddelivery = document.getElementsByClassName("seconddelivery");
      this.$nextTick(() => {
        let opts = {};
        html2canvas(delivery[0], opts).then((canvas) => {
          if (seconddelivery[0].childNodes.length) {
            seconddelivery[0].removeChild(seconddelivery[0].childNodes[0]);
          }
          seconddelivery[0].appendChild(canvas);
          that.deliveryData.base64Data = canvas.toDataURL("image/png");
        });
      });

//将照片复制到剪贴版
	copyImgBtn() {
      let base64Data = this.deliveryData.base64Data.split(",")[1];
      const blobInput = this.convertBase64ToBlob(base64Data, "image/png");
      const clipboardItemInput = new ClipboardItem({ "image/png": blobInput });
      navigator.clipboard.write([clipboardItemInput]);
      this.$message.success("复制照片成功！");
    },
    convertBase64ToBlob(base64, type) {
      var bytes = window.atob(base64);
      var ab = new ArrayBuffer(bytes.length);
      var ua = new Uint8Array(ab);
      for (var i = 0; i < bytes.length; i++) {
        ua[i] = bytes.charCodeAt(i);
      }
      return new Blob([ab], { type: type });
    },