Combined with PHP verification code picture generation realization Click Refresh

Source: Internet
Author: User
<!--here Math.random () is a method of generating random numbers from the math object of JS, which returns a decimal number between 0 and 1 (excluding 1), which is randomly returned each time the method is invoked. So, use a new parameter to request the current resource again, so that the The browser will assume that this is a different resource and will not be returned from the cache, which is most commonly the case with the validation code refresh. -->

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