webview重新加载（reload）或者发起 redirect request导致js和objc代码之间的bridge失联解决方案（亲测有效）

- (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType { 
//isNotFirstLoad' marks if it is the fisrt load.

//isNotFirstLoad是代表当前这个webview是不是已经加载了一次request
if (isNotFirstLoad) { //如果不加上这个判断，后面出现的loadRequest函数的调用就会导致出现死循环
    //create an new webview
    CGRect frame = _myWebView.frame;
    [_myWebView removeFromSuperview];
    _myWebView = [[EasyJSWebView alloc] initWithFrame:frame];       
    [self.view addSubview:_myWebView];
    //init the new webview
    _webView.delegate = self;
    javaScriptInterface* interface = [javaScriptInterface new];

    [self.webView addJavascriptInterfaces:interface WithName:@"interface"];
    [_myWebView loadRequest:request]; 
    //reset the firstload flag to load the new request             
    isNotFirstLoad = NO; //返回No，则不加载本方法传入的的request
    return NO;
}
isNotFirstLoad = YES;

return YES; //YES if the web view should begin loading content; otherwise, NO .

}