How can I use the data of axios's response outside?

I want a common function like this

   function getSrc() {   
          var src = axios.get('assist/img/src')
               .then(function (response) {
                     return response.data; // the response.data is string of src
               })
               .catch(function (response) {
                    console.log(response);
               });
          // doing other something
          return src;
   }

but I can't got right value, and I know this is wrong way.

How to do can implement it like this ?

Something need to be supplement.

The reason why I want this is that I don't want function's change affect where call it.

For example, I use jQuery's ajax instead of axios to get something of Server, maybe would be trouble.