base64转浏览器blob对象

export function convertBase64ToBlob(base64) {
    var base64Arr = base64.split(',');
    var imgtype = '';
    var base64String = '';
    if (base64Arr.length > 1) {
        base64String = base64Arr[1];
        imgtype = base64Arr[0].substring(base64Arr[0].indexOf(':') + 1, base64Arr[0].indexOf(';'));
    }
    var bytes = atob(base64String);
    var bytesCode = new ArrayBuffer(bytes.length);
    var byteArray = new Uint8Array(bytesCode);
    for (var i = 0; i < bytes.length; i++) {
        byteArray[i] = bytes.charCodeAt(i);
    }
    return new Blob([bytesCode], { type: imgtype });
}

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