Angular - Changed image in server not reflecting in view

问题

I have an Angular application which shows people profile images(loaded from a server) and has an option to change it.

When the application loads the first time, the image is displayed properly. I call a web service to change the image on a server. The problem is even after changing the image on remote server, the image on the browser is not reflecting the change even on refreshing the page.

I tried using the meta tags to disable caching but it's not working for me.

The image changes on the browser only after I delete the browser cache. How can I solve this?

Example Flow based on Comments:

1. Initial path: http://server_path/image_name.jpg
2. Call web service and change the image (NOTE: path of image does not change. Only the image itself is replaced)
3. Refresh the page on browser

PROBLEM: Changed image not reflected.

回答1:

If it is getting cached in the browser, you can force every request for the image to use a different URL, and so always request the server, by appending a different query string to it, say equal to the current number of milliseconds since 1970. A short custom directive is probably a good way:

app.directive('noCacheSrc', function($window) {
  return {
    priority: 99,
    link: function(scope, element, attrs) {
      attrs.$observe('noCacheSrc', function(noCacheSrc) {
        noCacheSrc += '?' + (new Date()).getTime();
        attrs.$set('src', noCacheSrc);
      });
    }
  }
});

that is used as

<img no-cache-src="http://upload.wikimedia.org/wikipedia/commons/thumb/5/51/Swallow_flying_drinking.jpg/320px-Swallow_flying_drinking.jpg">

(much as ngSrc would be used). You can see a demo in this plunker.

Note, the directive as written will probably not work if the src already has a query string. It might need to test for the presence of a ? and adjust how it behaves (i.e. if there is a ?, add & + seconds instead).

Edit: simplified by just using one directive.

来源：https://stackoverflow.com/questions/23285280/angular-changed-image-in-server-not-reflecting-in-view