MT4，MQL4,相对强弱指示MQL4写指标两种方法 RSI指些的老式写法，新旧两种写法结果一样，但写法有一定区别。(MT4, MQL4, relative strength indicate MQL4 write index two methods, RSI refers to some old style writing, the new and old two writing results are the same, but there is a certain difference b