建一个BeanShell Sampler，方便调试
修改前：
long s = ${__time(/100000,)};
long y = ${__Random(1,100000,)};
long z = s+y;
vars.put("xxx_id",z); //类型转换成String通过异常发现，Error in method invocation: Method jmeter put( java.lang.String, long ) not found in class‘org.apache.jmeter.threads.JMeterVariables‘
大胆猜测，put的value应该是String。验证猜想：
修改后如下 ,
类型转成string，就不报错了
long s = ${__time(/100000,)};
long y = ${__Random(1,100000,)};
long z = s+y;
vars.put("XXX_id",z.toString()); //类型转换成String