@lancercomet/utils/dist/blob.js

My personal utils lib.

/**
 * 将 Base64 转换为 Blob.
 *
 * @param {string} base64
 * @returns {Blob}
 */
function base64ToBlob(base64) {
    var byteString = atob(base64.split(',')[1]);
    var mimeString = base64.split(',')[0].split(':')[1].split(';')[0];
    var buffer = new ArrayBuffer(byteString.length);
    var uint8Array = new Uint8Array(buffer);
    for (var i = 0; i < byteString.length; i++) {
        uint8Array[i] = byteString.charCodeAt(i);
    }
    return new Blob([buffer], { type: mimeString });
}
/**
 * 将 Blob 转换为 Base64.
 *
 * @param {Blob} blob
 * @returns {Promise<string>}
 */
function blobToBase64(blob) {
    return new Promise(function (resolve, reject) {
        var fileReader = new FileReader();
        fileReader.addEventListener('load', function (event) {
            var base64 = event.target.result;
            resolve(base64);
        });
        try {
            fileReader.readAsDataURL(blob);
        }
        catch (error) {
            reject(error);
        }
    });
}
export { base64ToBlob, blobToBase64 };