var test=test.replace(/font-size:\w+;?/g,'');
修改UIWebView控件中字体的样式：
NSString *htmlString = [NSString stringWithContentsOfFile:self.webPath encoding:NSUTF8StringEncoding error:nil];
UIFont *font = [UIFont systemFontOfSize:12];
NSString *newHtmlString = [NSString stringWithFormat:@"<font face='%@' >%@", font.fontName,htmlString];
[self.myWebView loadHTMLString:newHtmlString baseURL:[NSURL URLWithString:self.webPath]];
修改UIWebView控件中字体的大小：
NSString *str = @"document.getElementsByTagName('body')[0].style.webkitTextSizeAdjust= '60%'";
[self.myWebView stringByEvaluatingJavaScriptFromString:str];
//给scrollview添加头视图
_htmlWebView.scrollView.contentInset = UIEdgeInsetsMake(40, 0, 0, 0);
_titleLabel = [[UILabel alloc] init];
[_htmlWebView.scrollView addSubview:_titleLabel];
_titleLabel.frame = CGRectMake(0, -40, _htmlWebView.frame.size.width, 40);
[_htmlWebView.scrollView addSubview:_titleLabel];
_titleLabel.text = @"标题";