利用JavaScriptCore实现以下简单的功能（平方和）

 1 #import "RootViewController.h"
 2 #import <JavaScriptCore/JavaScriptCore.h>
 3 
 4 @interface RootViewController ()<UIWebViewDelegate>
 5 @end
 6 
 7 @implementation RootViewController
 8 
 9 - (void)viewDidLoad {
10     [super viewDidLoad];
11     
12     JSContext *context = [[JSContext alloc] init];
13     [context evaluateScript:@"var square = function(x){return x*x;}"];
14     JSValue *squareFunction = context[@"square"];
15     JSValue *nineSquared = [squareFunction callWithArguments:@[@9]];
16     NSLog(@"9^2:%@",nineSquared);
17     
18 }
19 
20 @end