webView

//设置背景透明
[_webview setOpaque:NO];

//初始化
 _webView = [[UIWebView alloc]initWithFrame:CGRectMake(0, _height * 0.15, _width, _height * 0.8)];

 _webView.dataDetectorTypes = UIDataDetectorTypeAll;
_webView.backgroundColor = [UIColor clearColor];
[_webView setOpaque:NO];

//加载本地的HTML文件
 NSURL *htmlURL = [[NSBundle mainBundle] URLForResource:@"index.html" withExtension:nil];
//    NSURL *htmlURL = [NSURL URLWithString:@"http://www.baidu.com"];
    NSURLRequest *request = [NSURLRequest requestWithURL:htmlURL];
    
    // 如果不想要webView 的回弹效果
    self.webView.scrollView.bounces = NO;
    // UIWebView 滚动的比较慢，这里设置为正常速度
    self.webView.scrollView.decelerationRate = UIScrollViewDecelerationRateNormal;
    [self.webView loadRequest:request];
    [self.view addSubview:self.webView];

注入JS

//webView加载完成
- (void)webViewDidFinishLoad:(UIWebView *)webView{
   
//js代码
    NSString *jsString = @"(function(){"
    "var objs = document.getElementsByTagName('img');"
    "for(var i=0,j=0;i<objs.length;i++)"
    "{"
       " var levelcode = objs[i].getAttribute('levelcode');"
       " if(levelcode=='-1'){"
            "continue;"
        "}"
        "objs[i].setAttribute('index',j);"
        "j++;"
        "objs[i].onclick=function()"
        "{"
            "var index = this.getAttribute('index');"
            "openImage(index);"
        "}"
    "}"
"})()";

  __weak typeof(self) weakSelf = self;
    [webView stringByEvaluatingJavaScriptFromString:jsString];
    //其中 openImage 是JS的函数名，得到的 arg数组 里面为JS的 passValue 函数的参数，即 JS要传给OC的参数。
    JSContext *context = [webView valueForKeyPath:@"documentView.webView.mainFrame.javaScriptContext"];

    context[@"openImage"] = ^{
        NSString *string;
        NSArray *arg = [JSContext currentArguments];
        for (id obj in arg) {
            string = [NSString stringWithFormat:@"%@",obj];
        }
        dispatch_async(dispatch_get_main_queue(), ^{
            NewDetailScrollViewController *vc = [[NewDetailScrollViewController alloc]init];
            [vc loadUIWithdataDict:weakSelf.dict indexImage:[string integerValue] isSearch:weakSelf.isSearch];
            [weakSelf.navigationController pushViewController:vc animated:YES];

        });
    };
}