OC调用JS内容

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<html>        <meta charset='utf-8'/>    <title>javascript</title>    <script>                function a(){                        alert('你好');                        return 'haha';        }                    </script>    <body>        你好啊        <button onclick='alert(1)'>这是一个按钮</button>    </body></html>

////  ViewController.m//  OCCallsJs////  Created by hq on 16/4/19.//  Copyright © 2016年 hanqing. All rights reserved.//#import "ViewController.h"@interface ViewController () <UIWebViewDelegate>@property (weak, nonatomic) IBOutlet UIWebView *webView;@end@implementation ViewController-(BOOL) prefersStatusBarHidden{    return YES;}- (void)viewDidLoad {        [super viewDidLoad];        NSURL *url=[[NSBundle mainBundle] URLForResource:@"index.html" withExtension:nil];        NSURLRequest *request=[NSURLRequest requestWithURL:url];        [self.webView loadRequest:request];        self.webView.delegate=self;}//加载结束-(void)webViewDidFinishLoad:(UIWebView *)webView{        [webView stringByEvaluatingJavaScriptFromString:@"a()"];    }@end

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