base64转换Blob数据
function dataURLtoBlob(dataurl: string) {
var arr = dataurl.split(','),
mime = arr[0].match(/:(.*?);/)[1],
bstr = atob(arr[1]),
n = bstr.length,
u8arr = new Uint8Array(n);
while (n--) {
u8arr[n] = bstr.charCodeAt(n);
}
eturn new Blob([u8arr], { type: mime });
}
// 使用示例:
var imgData = canvas.toDataURL({ format: 'png', quality: 1, width: 20000, height: 4000 });
var blob = dataURLtoBlob(imgData);
canvas转换Blob数据
canvas.toBlob(function (blob) {
console.log(blob)
saveAs(blob, '图片下载.jpeg')
})