OC：
NSString *str = @"lu";
NSLog(@"內(nèi)存地址：%p - 指針地址：%p",str, &str);
Swift：
var str = "lu"
內(nèi)存地址：
print(String(format: "%p", str))
指針地址：
let pointer = withUnsafePointer(to: &str, {$0})
print("\(pointer)")
swift指針參考：http://www.cocoachina.com/articles/26419
https://blog.csdn.net/GuoHeroes/article/details/81043747
