下载实现

参考：https://juejin.cn/post/6989907294435688478

一个图片ur1访问后直接下载怎样实现？

https://blog.csdn.net/cheze3730/article/details/100596313

图片下载

downloadIamge(imgsrc, name) {//下载图片地址和图片名  
  let image = new Image();  
  // 解决跨域 Canvas 污染问题  
  image.setAttribute("crossOrigin", "anonymous");  
  image.onload = function() {  
    let canvas = document.createElement("canvas");  
    canvas.width = image.width;  
    canvas.height = image.height;  
    let context = canvas.getContext("2d");  
    context.drawImage(image, 0, 0, image.width, image.height);  
    let url = canvas.toDataURL("image/png"); //得到图片的base64编码数据  
    let a = document.createElement("a"); // 生成一个a元素  
    let event = new MouseEvent("click"); // 创建一个单击事件  
    a.download = name || "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 = imgsrc;

JavaScript 下载文件

  fetch('http://somehost/somefile.zip').then(res => res.blob().then(blob => {  
  var a = document.createElement('a');  
  var url = window.URL.createObjectURL(blob);  
  var filename = 'myfile.zip';  
  a.href = url;  
  a.download = filename;  
  a.click();  
  window.URL.revokeObjectURL(url);