JMeter components are scoped, and often a regular expression variable extractor, without the use of a variable parameter in order, all you need to set variables thread assembly
JMeter helper function provides a function to set a global variable property function, implemented in the user-defined variables similar variables added.
__setProperty: setting a dynamic attribute JMeter
Return Original Value of property (default false)? : Whether to return the function result, the default is no, fill if true, then returns
For example: regular expressions to extract the value of the variable
Use BeanShell PostProcessor set of global variables
Meaning that the variable $ {old_variable} is set to get a global variable, and a new name to be referenced new_variable
2 in the thread group _p function to call jmeter properties, getting a property value, so that cross-thread group, the parameter value is passed.
Note: $ {__ P (new_variable,)} behind a comma do not forget, this variable is referenced success.