利用JavaScriptCore实现简单的功能（阶乘）

#import "RootViewController.h"
#import <JavaScriptCore/JavaScriptCore.h>

@interface RootViewController ()
@end

@implementation RootViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    
    JSContext *context = [[JSContext alloc] init];
    context[@"factorial"] = ^(int x){
        int factorial = 1;
        for (; x > 1; x--) {
            factorial *= x;
        }
        return factorial;
    };
    [context evaluateScript:@"var fiveFactorial = factorial(5);"];
    JSValue *fiveFactorial = context[@"fiveFactorial"];
    NSLog(@"5! = %@",fiveFactorial);
    
}

@end