UIwebView + JS 交互

_dic是NSMutableDictionary类型

 //参数 一定是json格式的

[_uiwebView stringByEvaluatingJavaScriptFromString:[NSString stringWithFormat:@"javascript:screeningCon(%@)",[self DataTOjsonString:_dic]]];

-(NSString*)DataTOjsonString:(id)object
{
    NSString *jsonString = nil;
    NSError *error;
    NSData *jsonData = [NSJSONSerialization dataWithJSONObject:object
                                                       options:NSJSONWritingPrettyPrinted // Pass 0 if you don't care about the readability of the generated string
                                                         error:&error];
    if (! jsonData) {
        NSLog(@"Got an error: %@", error);
    } else {
        jsonString = [[NSString alloc] initWithData:jsonData encoding:NSUTF8StringEncoding];
    }
    return jsonString;
}