Download img tag inside the picture JS code

In doing dynamically generated two-dimensional code uses dynamically generated images need to be downloaded to generate any file on a local, not on the server, only the page showing pictures downloaded to the local.

code show as below:

1  // download dimensional code 
2      function downloadIamge () {
 . 3          var (IMG tag ID of the parent element) imgs = document.getElementById .getElementsByTagName ( "IMG" );
 . 4          var A = document.createElement ( 'A' );
 . 5          = a.download 'XDS' + new new a Date () the getTime () || 'Photo name';. // here is the file name, you can be customized 
. 6          a.href imgs = [0 ] .src;
 . 7          document. body.appendChild (A);
 . 8          a.click ();
 . 9          document.body.removeChild (A);
 10      }