vue将页面(dom元素)转换成图片，并保存到本地

1 npm install html2canvas --save

<template>
  <div class="QRCode-box">
    <img id="imageWrapper" class="QRCode" src="@/assets/shun.png" alt="" />
    <button color="#29c37f" type="info" @click="toSave"
      >保存二维码到手机</button
    >
  </div>
</template>

<script lang="ts">
import { defineComponent, onMounted, reactive, ref } from "vue";
import html2canvas from 'html2canvas'
export default defineComponent({
  setup() {
    const state = reactive<InitData1>({});

    const toSave = () => {
      const candom: any = document.getElementById("imageWrapper")
      html2canvas(candom).then((canvas) => {
        let saveUrl = canvas.toDataURL("image/png");    //将图片元素转成base64图片
        console.log(saveUrl)
        let aLink = document.createElement("a");
        let blob = base64ToBlob(saveUrl);    //将base64转成blob流
        console.log(blob)
        let evt = document.createEvent("HTMLEvents");
        evt.initEvent("click", true, true);
        aLink.download = "二维码.jpg";
        aLink.href = URL.createObjectURL(blob);  //转成下载链接
        aLink.click();
        console.log(aLink.href);
        if (aLink.href) {
          alert('保存成功')
        }
      });
    };

    return {
      toSave,
    };
  },
});
// 这里把图片转base64
function base64ToBlob(code: any) {
  let parts = code.split(";base64,");
  let contentType = parts[0].split(":")[1];
  let raw = window.atob(parts[1]);
  let rawLength = raw.length;
  let uInt8Array = new Uint8Array(rawLength);
  for (let i = 0; i < rawLength; ++i) {
    uInt8Array[i] = raw.charCodeAt(i);
  }
  return new Blob([uInt8Array], { type: contentType });
}
</script>