CoolCode使用方法与下载(2)

functionlinenumber(o){     if (o.className == "hl-main ln-hide"){         o.title = "Double click to hide line number.";         o.className = "hl-main ln-show";     } else{         o.title = "Double click to show line number.";         o.className = "hl-main ln-hide";     } }