add jwt base64code fuction

wangrong

2021-12-22 ce252a6aa052e8fcb161797a556f51c78f616fc7

1
"undefined"==typeof self&&(self={}),self.onmessage=function(s){var e=s.data.array,s=self.webkitPostMessage||self.postMessage;try{s({array:e},[e.buffer])}catch(e){s({})}};