javascript操作cookie的方法
第一步:1.servlet或者jsp设置的cookie是可以用javascript来读取的,但是设置就会出现重名的现象.
2.最近项目用到一个可有可无的功能,就是每24小时弹出一个消息框,告诉用户分享资源,这样的功能用cookie是再合适不过了.
第二步:
1.以下的代码是javascript实现cookie用到的基础方法:
function GetCookieVal(offset)//获得Cookie解码后的值{var endstr = document.cookie.indexOf (";", offset);if (endstr == -1)endstr = document.cookie.length;return unescape(document.cookie.substring(offset, endstr));}function SetCookie(name, value)//设定Cookie值{var expdate = new Date();var argv = SetCookie.arguments;var argc = SetCookie.arguments.length;var expires = (argc > 2) ? argv : null;var path = (argc > 3) ? argv : null;var domain = (argc > 4) ? argv : null;var secure = (argc > 5) ? argv : false;expdate.setTime(expdate.getTime() + 1000*60*60*24 );//设置cookie在客户端的存活时间document.cookie = name + "=" + escape (value)+"; expires="+ expdate.toGMTString() + ";path=/";//设置根路径和存活的时间}function DelCookie(name)//删除Cookie{var exp = new Date();exp.setTime (exp.getTime() - 1);var cval = GetCookie (name);document.cookie = name + "=" + cval + "; expires="+ exp.toGMTString();}function GetCookie(name)//获得Cookie的原始值{var arg = name + "=";var alen = arg.length;var clen = document.cookie.length;var i = 0;while (i < clen){var j = i + alen;if (document.cookie.substring(i, j) == arg)return GetCookieVal (j);i = document.cookie.indexOf(" ", i) + 1;if (i == 0) break;}return null;}//公共处理发表feedfunction getFeedStatus(num){var cookieName = "FEED_COOKIE_STATE";var result = false;if( cookieName==null || cookieName=="" ){return result;}var cookieValue = GetCookie(cookieName);if(cookieValue==null){return result;}if( num>=cookieValue.length || num<0 ){return result;}if(cookieValue.charAt(num)!=null && cookieValue.charAt(num)=="0"){cookieValue = cookieValue.substring(0,num) + "1" + cookieValue.substring(num+1);SetCookie(cookieName,cookieValue);result = true;}return result;}
参考资料:
1.www.theseach.com
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