//将base64转换为blob
dataURLtoBlob: function (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 this.blobToFile(new Blob([u8arr], { type: mime }), { type: mime });
},
//将blob转换为file
blobToFile: function (theBlob, type) {
theBlob.lastModifiedDate = new Date();
// theBlob.name = fileName;
// return theBlob;
return new File([theBlob], `${new Date().getTime()}.png`, type);
},