前端實現訪問一個圖片URL直接下載該圖片

function downloadIamge(imgsrc, name){
 
  let image = new Image();
 
  // 解決跨域 Canvas 污染問題
  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"); //得到圖片的base64編碼數據
 
    let a = document.createElement("a"); // 生成一個a元素
 
    let event = new MouseEvent("click"); // 創建一個單擊事件
 
    a.download = name || "photo"; // 設置圖片名稱
 
    a.href = url; // 將生成的URL設置為a.href屬性
 
    a.dispatchEvent(event); // 觸發a的單擊事件
 
  }
 
  image.src = imgsrc;
}

downloadIamge('http://172.168.10.21:3006/test/image/download','ppcm')