vue前端根据接口返回的url 下载图片

downloadPicture(imgSrc, name) {

const image = new Image();

// 解决跨域 Canvas 污染问题

image.setAttribute("crossOrigin", "anonymous");

image.src = imgSrc;

image.onload = () => {

const canvas = document.createElement("canvas");

canvas.width = image.width;

canvas.height = image.height;

const context = canvas.getContext("2d");

context.drawImage(image, 0, 0, image.width, image.height);

canvas.toBlob((blob) => {

const url = URL.createObjectURL(blob);

const a = document.createElement("a");

a.download = name || "photo";

a.href = url;

a.click();

a.remove();

URL.revokeObjectURL(url);

});

};

},

downLineFlow(row) {

this.downloadPicture(row.signatureUrl, row.username);

},