點(diǎn)擊canvas 元素執(zhí)行 saveQRcode 函數(shù)
html

<canvas ref="canvas" @click="saveQRcode"></canvas>

js

import saveQRcode from "@/utils/saveQRcode"

    saveQRcode() {
      var oCanvas = this.$refs.canvas;
      // 保存 oCanvas 到本地
      saveQRcode(oCanvas.toDataURL(), new Date());
    },

saveQRcode.js

var saveQRcode = function (base64, name) {
  downloadFileByBase64(base64, name)
}
function downloadFile(url, name = new Date()) {
  var a = document.createElement("a");
  a.setAttribute("href", url);
  a.setAttribute("download", name);
  a.setAttribute("target", "_blank");
  let clickEvent = document.createEvent("MouseEvents");
  clickEvent.initEvent("click", true, true);
  a.dispatchEvent(clickEvent);
}

function downloadFileByBase64(base64, name) {
  var myBlob = dataURLtoBlob(base64);
  var myUrl = URL.createObjectURL(myBlob);
  downloadFile(myUrl, name);
}
function dataURLtoBlob(dataurl) {
  var arr = dataurl.split(","),
    mime = arr[0].match(/:(.*?);/)[1],
    bstr = atob(arr[1]),
    n = bstr.length,
    u8arr = new Uint8Array(n);
  while (n--) {
    u8arr[n] = bstr.charCodeAt(n);
  }
  return new Blob([u8arr], { type: mime });
}
export default saveQRcode