-(NSString *)filterHTML:(NSString *)html
{
NSScanner * scanner = [NSScanner scannerWithString:html];
NSString * text = nil;
while([scanner isAtEnd]==NO)
{
//找到标签的起始位置
[scanner scanUpToString:@< intoString:nil];
//找到标签的结束位置
[scanner scanUpToString:@> intoString:&text];
//替换字符
html = [html stringByReplacingOccurrencesOfString:[NSString stringWithFormat:@%@>,text] withString:@];
}
NSString * regEx = @<([^>]*)>;
html = [html stringByReplacingOccurrencesOfString:regEx withString:@];
return html;
}