1、如下代码
let img = new Image();
img.setAttribute("crossOrigin",'anonymous');
img.src = url+ `?timestamp= ${+new Date()}`; //谷歌浏览器下可能会用缓存，避免用缓存增加时间戳防止提示跨域
img.onload = function(){
let canvas = document.createElement('canvas');
canvas.width = img.width;
canvas.height = img.height;
let ctx = canvas.getContext('2d');
ctx.drawImage(img,0,0,canvas.width,canvas.height)
let base = canvas.toDataURL('image/jpeg',0.95)
resolve(base)
}
img.onerror=function(){
message.warning('转换图片失败,用火狐浏览器')
resolve()
}
