Verification code in IE does not refresh and Google and other browsers, the normal solution

In IE, the verification code will not be refreshed, and Google and other browsers have no problems, the solution is to verify the number of the switch address after the addition of a random parameter

Today in the verification code found in IE, the verification code will not be refreshed, and Google and other browsers do not have problems, so I think it should be a cache problem, because the IE default setting is that if the access address does not change will not go to get the contents of the load cache So the solution is to add a random parameter after the switching address of the verification code for example: The code is as follows: <script>//Change authentication code function changeimg () {/* Math.random range is 0-1 *999 into 0-99  9 +3000 is 3000-3999 * * * var time=math.round (math.random () *999) +3000;  $ (' #captcha '). attr (' src ', ' __app__/public/verify/time/' +time); } </script>