NSAttributedString * attrStr = [[NSAttributedString alloc] initWithData:[html dataUsingEncoding:NSUnicodeStringEncoding] options:@{ NSDocumentTypeDocumentAttribute: NSHTMLTextDocumentType } documentAttributes:nil error:nil];
_attriLabel.attributedText = attrStr;
但这里会有个坑，在代理方法- (void)webViewDidFinishLoad:(UIWebView *)webView{}里面设置的话，attrStr总是得到nil，移到代理方法外面设置就ok，具体原因还未深究，待续
