HTML解析

 NSString *str = [NSString stringWithContentsOfURL:[NSURL URLWithString:@"http://dict.youdao.com/search?le=eng&q=success&keyfrom=dict.top"] encoding:NSUTF8StringEncoding error:nil];//把这个网址的内容以UTF-8编码保存在字符串中
    NSError *error;
    if (error)//一旦出错，程序自动返回
    {
        return;
    }
    HTMLParser *parser = [[HTMLParser alloc]initWithString:str error:&error];//定义一个解析HTML工具的对象，来使用开源代码
    HTMLNode *node = [parser body];//确定程序最大的那个body节点，选出这个节点，再在body节点中找我们要的数据
    NSArray *keyword = [node findChildrenWithAttribute:@"class" matchingName:@"keyword" allowPartial:YES];
    //定位单词的位置在node节点中keybode下面，
    for (HTMLNode *a in keyword)
    {
        NSLog(@"%@",[a contents]);//把keyboard内容依次打印输出
    }
    NSArray *fanyi = [node findChildrenWithAttribute:@"class" matchingName:@"trans-container" allowPartial:YES];
        HTMLNode *ul = [fanyi[0] findChildTag:@"ul"];
        HTMLNode *li = [ul findChildTag:@"li"];
        NSLog(@"%@",[li contents]);
    
    HTMLNode *ol = [node findChildWithAttribute:@"class" matchingName:@"ol wordGroup" allowPartial:YES];
    NSArray *word = [ol findChildrenOfClass:@"wordGroup"];
    NSLog(@"%@",word);
    for (HTMLNode *b in word)
    {
        HTMLNode *span = [b findChildTag:@"span"];
        NSLog(@"%@",[span contents]);

    }