/**
|
* @description: base64 to blob
|
*/
|
export function dataURLtoBlob(base64Buf: string): Blob {
|
const arr = base64Buf.split(',');
|
const typeItem = arr[0];
|
const mime = typeItem.match(/:(.*?);/)![1];
|
const bstr = window.atob(arr[1]);
|
let n = bstr.length;
|
const u8arr = new Uint8Array(n);
|
while (n--) {
|
u8arr[n] = bstr.charCodeAt(n);
|
}
|
return new Blob([u8arr], { type: mime });
|
}
|
|
/**
|
* img url to base64
|
* @param url
|
*/
|
export function urlToBase64(url: string, mineType?: string): Promise<string> {
|
return new Promise((resolve, reject) => {
|
let canvas = document.createElement('CANVAS') as Nullable<HTMLCanvasElement>;
|
const ctx = canvas!.getContext('2d');
|
|
const img = new Image();
|
img.crossOrigin = '';
|
img.onload = function () {
|
if (!canvas || !ctx) {
|
return reject();
|
}
|
canvas.height = img.height;
|
canvas.width = img.width;
|
ctx.drawImage(img, 0, 0);
|
const dataURL = canvas.toDataURL(mineType || 'image/png');
|
canvas = null;
|
resolve(dataURL);
|
};
|
img.src = url;
|
});
|
}
|