【vue】 vue2 点击按钮下载图片

<template>
  <div class="index">
    <!-- 用的element-ui需注册 -->
    <el-button @click="download()">下载图片</el-button>
  </div>
</template>
<script>
export default {
  data() {
    return {
      Img: "https://m1.im5i.com/2022/09/25/UFWId.png", // 图片链接
    };
  },
  methods: {
    download() {
      var image = new Image();
      image.setAttribute("crossOrigin", "anonymous");
      var _this = this;
      image.onload = function () {
        var canvas = document.createElement("canvas");
        canvas.width = image.width;
        canvas.height = image.height;
        var context = canvas.getContext("2d");
        context.drawImage(image, 0, 0, image.width, image.height);
        var url = canvas.toDataURL("image/png"); //得到图片的base64编码数据
        var a = document.createElement("a"); // 生成一个a元素
        var event = new MouseEvent("click"); // 创建一个单击事件
        a.download = _this.projectName || "photo"; // 设置图片名称
        a.href = url; // 将生成的URL设置为a.href属性
        a.dispatchEvent(event); // 触发a的单击事件
      };
      image.src = this.Img;
    },
  },
};
</script>