在10ms的间隔内通过json检查/显示变量的值。

I am trying to make a progress circle using jquery knob and php. Jquery knob should get the value via ajax/json of the variable from php that is counting the iterations With this php script I am getting the percentage of the total iteration that had been done. The idea is to get with jquery, the number from here json_encode($percentage) every 20 ms. So it appears like a progress circle and fullfill it with color based on the number that gets from the json_encode($percentage) Please help me I am a noob in jquery but I know a bit of php.I am trying to make a progress circle using jqu