functiondataURLtoBlob(dataurl){
vararr=dataurl.split(','),mime=arr[0].match(/:(.*?);/)[1],
bstr=atob(arr[1]),n=bstr.length,u8arr=newUint8Array(n);
while(n--){
u8arr[n]=bstr.charCodeAt(n);
}
returnnewBlob([u8arr],{type:mime});
}
varblob=dataURLtoBlob('data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7');
console.log(blob);