• OC 調用 JS

/* 
 1. OC 調用 JS  只需在所需要傳值的地方獲取到JS中的點擊方法即可 
    例如: 點擊方法是下面的這個 functionAction 
 */  

- (void)functionAction {  
    //如果需要傳遞參數 給 JS，則初始化參數  
    NSString *str2 = @"1234mkfg";  
    NSString *str3 = @"kdsfj";  
   //傳參數  
   [_webView stringByEvaluatingJavaScriptFromString:[NSString stringWithFormat:@"func('%@', '%@');", str2, str3]];  
}

• 用蘋果自帶的返回鍵按鈕處理如下(自定義的返回按鈕)

- (void)back:(UIBarButtonItem *)bon{
    if ([self.webView canGoBack]) {
    [self.webView goBack];
}else{
    [self.view resignFirstResponder];
    [self.navigationController popViewControllerAnimated:YES];
   }
}

• 如果是H5頁面里面自帶的返回按鈕處理如下:

- (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType {
NSString * requestString = [[request URL] absoluteString];
requestString = [requestString stringByReplacingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
//獲取H5頁面里面按鈕的操作方法,根據這個進行判斷返回是內部的還是push的上一級頁面
if ([requestString hasPrefix:@"goback:"]) {
    [self.navigationController popViewControllerAnimated:YES];
}else{
    [self.webView goBack];
}
return YES;
}

• 獲取當前頁面的title和url

- (void)webViewDidFinishLoad:(UIWebView *)webView
{
[SVProgressHUD dismiss];
 NSString * title = [webView stringByEvaluatingJavaScriptFromString:@"document.title"];//獲取當前頁面的title
self.title = title;
//獲取當前網頁的html
self.currentURL = webView.request.URL.absoluteString;
NSLog(@"title-%@--url-%@--",self.title,self.currentURL);
NSString *lJs = @"document.documentElement.innerHTML";
self.currentHTML = [webView stringByEvaluatingJavaScriptFromString:lJs];
}