利用JavaScriptCore实现简单的功能（阶乘）

 1 #import "RootViewController.h"

 2 #import <JavaScriptCore/JavaScriptCore.h>

 3 

 4 @interface RootViewController ()

 5 @end

 6 

 7 @implementation RootViewController

 8 

 9 - (void)viewDidLoad {

10     [super viewDidLoad];

11     

12     JSContext *context = [[JSContext alloc] init];

13     context[@"factorial"] = ^(int x){

14         int factorial = 1;

15         for (; x > 1; x--) {

16             factorial *= x;

17         }

18         return factorial;

19     };

20     [context evaluateScript:@"var fiveFactorial = factorial(5);"];

21     JSValue *fiveFactorial = context[@"fiveFactorial"];

22     NSLog(@"5! = %@",fiveFactorial);

23     

24 }

25 

26 @end