如何将这个奇怪的（HEX？）字符串转换为ASCII-PLAIN

Question

My Webservice return a strange format , I neet that string plain...

I tried to convert to ascii but return a strange thing

I tried this function but doesnt work...

  function hex_to_ascii(str1) {
                                  var hex = str1.toString();
                                  var str = '';
                                  for (var n = 0; n < hex.length; n += 2) {
                                      str += String.fromCharCode(parseInt(hex.substr(n, 2), 16));
                                  }
                                  return str;
                              }

STEPS

INSERT ASCII (type IMAGE field in table) ---data:image/jpeg;base64,/9j/4AAQSkZJRgABAQAA ...
SELECT HEX --- 0x646174613A696D6167652F6A70..
WEBSERVICE RARE ---- ZGF0YTppbWFnZS9qcGVnO2J...

I need to convert in javascript that rare to ASCII/Plain again

Answer 1

This is base64 encoded image which is base64 encoded again. Just use the atob() javascript native function instead of your hex_to_ascii() function.

Example:

atob("ZGF0YTppbWFnZS9qcGVnO2Jhc2...Z1J2L0FQL1o") // your full string

Which return:

data:image/jpeg;base64,/9j/4AAQSkZJ...