1, recently use qrcode.js to generate the QR code, and then get the src (data:image/png;base64) in the generated QR code img. 
 process is: string--> (through qrcode)--> QR code--> src 
 2 in img. The purpose you want: 
 is there a way to skip the generation of QR code and directly generate a string in data:image/png? 
I"m sorry for the awkwardness of the language.
