一.objective-c调用js

NSString *currentURL = [webView stringByEvaluatingJavaScriptFromString:@"document.location.href"];  
//注: webView是UIWebView实例  

二.js调用objective-c

1.obj-c部分

- (void)viewDidLoad {  
    [super viewDidLoad];  
    self.myWebView.delegate=self;  
}  
//-------------------------------------------------  
- (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType   
{  
    //此url解析规则自己定义  
    NSString* rurl=[[request URL] absoluteString];  
    if ([rurl hasPrefix:@"protocol://"]) {  
        UIAlertView* alert=[[UIAlertView alloc]initWithTitle:@"Called by JavaScript"   
                                                     message:@"You've called iPhone provided control from javascript!!" delegate:self cancelButtonTitle:@"Cancel" otherButtonTitles:nil];  
        [alert show];  
        [alert release];  
        return false;  
    }  

    return true;  
}  

2. js部分

function sendCommand(cmd,param){    
    var url="protocol://"+cmd+":"+param;    
    document.location = url;    
}  

3.html部分

<input type="button" value="call obj-c" onClick="sendCommand('act','param');" />