摘自http://www.cnblogs.com/fj99/p/5502130.html
base64转blob
function base64ToBlob(dataurl) {
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);
}
return new Blob([u8arr],{type: mime});
}
blob 转 dataURL
function blobToDataURL(blob, callback) {
var a =new FileReader();
a.onload=function(e) {
callback(e.target.result);
}
a.readAsDataURL(blob);
}
