Why does the verification code not refresh when clicked

Generate verification code in the background , The foreground displays the verification code , But clicking the verification code does not refresh ,google F12 But when you click it, it will refresh .

It is always assumed that repeated requests under the same path , I'm driving disable cache It will not be cached when , After opening the settings, I found disable cache Only in developer mode （F12） To come into force next , In normal mode , The data requested repeatedly is still cached , The solution is as follows ：