jmeter parameterized function of 4_Function Helper

Function Helper functions of: as a supplementary item of embodiment other parameters, such as: random number generation function $ {__ Random (,,)}

1. Operating path: operation path: Options -> Function Helper Dialog 
2. Select a function of the parameters, the function configuration 
3. Parameter configuration request HTTP sampler 

4. Configuring Thread Group 

5. Execute Run, to see the effect