If the controller in use Jmeter

If the controller using two ways:
1. uncheck "interpret condition as variable expression"
direct input to an expression we need to determine, it is determined the expression is true, the execution controller requests if, for example, "1 ! = 2 ", the following will be executed http requests

2. Select" interpret condition as variable expression "
time expression can not fill out the conditional expression, the function required by the condition expression evaluates to true / false, can use function and have _jexl3 _groovy, for example: direct fill $ {modelId} == 5, is not recognized by
a helper function means, generating expression.

B generated by the expression, if written in the controller.

C. then if the controller can read Analyzing matter content, when the condition is true, perform the following request.