NSMutableDictionary和NSMutableArray崩溃

Created by: chendaming

NSMutableDictionary *dict = @{ @"name" : @"text"

                              }.mutableCopy;
NSString *ageKey = nil;
dict[ageKey] = @(25);
NSLog(@"%@",dict);

NSMutableArray *array = @[@"text"].mutableCopy; array[3] = @"iOS";

这样会导致崩溃