使用圖片地址進行下載

解決方式1

export const downloadImg = (url: string, fileName: string) => {
  const x = new XMLHttpRequest()
  x.open('GET', url, true)
  x.responseType = 'blob'
  // eslint-disable-next-line func-names
  x.onload = function () {
    const resultUrl = window.URL.createObjectURL(x.response)
    const a = document.createElement('a')
    a.href = resultUrl
    a.download = fileName
    a.click()
  }
  x.send()
}

解決方式2

var downloadIamge = function(imgsrc, name) {//下載圖片地址和圖片名
  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設置爲a.href屬性
    a.dispatchEvent(event); // 觸發a的單擊事件
  };
  image.src = imgsrc;