如何在Angular 8中将base64图像放在垫卡上

function dataURItoBlob(dataURI) {
  const byteString = atob(dataURI.split(',')[1]);
  const mimeString = dataURI.split(',')[0].split(':')[1].split(';')[0];
  const ab = new ArrayBuffer(byteString.length);
  const ia = new Uint8Array(ab);
  for (let i = 0; i < byteString.length; i++) {
    ia[i] = byteString.charCodeAt(i);
  }
  return new Blob([ab], { type: mimeString });
}

import { Component, ViewChild, ElementRef, AfterViewInit } from '@angular/core';

@Component({
  selector: 'app-image-placeholder',
  template: '<canvas #canvas></canvas>'
})
export class ImagePlaceholderComponent implements AfterViewInit {
  @ViewChild('canvas', { static: true }) canvas: ElementRef;

  ngAfterViewInit() {
    const canvasEl: HTMLCanvasElement = this.canvas.nativeElement;
    const ctx = canvasEl.getContext('2d');
    
    const image = new Image();
    image.src = 'path/to/your/image.jpg'; // 替换为你的图像路径
    image.onload = () => {
      canvasEl.width = image.width;
      canvasEl.height = image.height;
      ctx.drawImage(image, 0, 0);
    };
  }
}